Adapting a block pattern into something else pt. 5 : Making the pocket pattern

Here's a sneak peak of the first sample of my cardigan pattern. I'm fairly pleased with the results, though there are a couple of minor pattern modifications to make. So more about all that later.

For now, we need to finish up the pattern. The last two pieces to deal with are the pockets (shown above) and the elastic casing. I referenced my sweater to determine the pocket dimensions and placement, which is basically a rectangle. Pockets come in all sorts of shapes and sizes with varying amounts of functionality. Pockets should be proportional to the overall garment. They can be graded for larger or smaller sizes to maintain proper proportions. Pockets can be applied in various ways and include seam and hem allowances.

I wanted a very casual look to my pocket so I used a narrow 3-thread serger hem around all four sides and topstitched it on. This allowed the fabric at the top of the pocket to roll. This detail mimics the detail on my sweater. I didn't have a lot of confidence in producing a neat topstiched pocket in which the raw edges are turned under. This is partly due to the fabric and my machine. For a more structured pocket this fabric would need a fusible to help stabilize it.

Pocket placement is noted on the pattern piece by a drill hole. In a factory, an actual hole is drilled into the fabric. I have seen knits marked with a drill that also contained a marking medium such as a washable marker. In that case, the drill bit was like a needle. My pattern at home will contain a hole large enough for a chalk marking pencil to fit. Even though there are lines on the pattern pieces indicating placement, they are not transferred to the actual fabric. They are just there for clarity.

The elastic casing is just another rectangle large enough to cover the elastic. I think mine is about 1/2" x 8".

Adapting a block pattern into something else pt. 3 : Modifying the t-shirt back pattern piece and sleeves to make the cardigan

For review read part 1 and 2 of this series.

Next up on my t-shirt block pattern transformation to a cardigan is to work on the pattern pieces for the back. I won't go into too much detail because there isn't much difference from the front.

Trace off the back and add the same length and width adjustments as the front. Extend the shoulder the same amount. Drop the armhole the same amount.

Next I add drill holes to indicate the elastic for the back waist. The elastic takes up some of the extra body ease in the back to make the cardigan appear more fitted. I didn't add additional design ease for extra fullness, just the same wearing ease as the front. If you draft your own pattern, you can add as much or as little as you want. I referenced the cardigan that I am knocking off for placement. In the picture below, the drill holes appear rather large, but that is just for clarity in the drawing. I'll take a picture of the finished pattern pieces when they are ready so you can see what it all looks like. In reality, the holes will only be large enough so a marking pen(cil) can make a mark.

I also modified my sleeve for length and width. My previous blog post on how to reduce/eliminate sleeve cap ease* should give you an idea of how to adjust the sleeve cap. Walk the sleeve cap along both the front and back armhole of the bodices pieces. The armscye should be longer than the sleeve cap. Note the difference and enlarge the sleeve cap so that it matches the armscye. You can do this by slashing and spreading. Do not add any sleeve cap ease. This is a myth perpetuated by pattern drafting manuals and others. You don't need it.

Finally, I referenced some cardigans in my closet to figure out how long to make the sleeve (plus hem) and how wide to make the wrist. I have a tendency to make my sleeves a little longer than necessary because long sleeves from off the rack stuff tend to be too short for me. Also, I worry about shrinkage. I will be pre-shrinking my knit fabric, but some knits will shrink with multiple washings. In any event, add the length you need for your sleeve.

Adapting a block pattern into something else pt. 1 : Noting changes for the new style

A block pattern is a sewing pattern that has been proven. It is a pattern that has been trued, perfected and finished with seam allowances. The pattern has been sewn up and tested for fit. In other words, a block pattern just works. A block pattern becomes a part of a pattern file which can be used to make other patterns.

In the industry we rarely draft from scratch. Instead we modify existing patterns (or blocks) into something else. Some pattern making gurus talk about using slopers. Slopers are basic patterns drafted from body measurements and do not have seam allowances. Industry level pattern makers use block patterns, with seam allowances on, to make patterns for new styles*. It saves time.

It's easier than you might think to do this and this is just one example. I'm sure other pattern makers have their own procedures. My own procedures adapt to whatever it is I'm working on and whether I'm using CAD or traditional methods.

The problem:

I have this much loved cashmere sweater jacket. I snagged it off a sales rack a couple of years ago and I absolutely love the cut and fit. You know, the perfect layering piece, warm and soft for those cool days. I usually clean it by running it through the dryer using a Dryel kit. This last time was a disaster as I had left a piece of chocolate in a pocket. Chocolate ended up all over the sweater and everything else. So, I decided to run it through the hand wash cycle on my washer. That was a mistake. While the chocolate did come out, the sweater shrank. It shrunk just enough that I'm not sure I can wear it anymore. It made me very sad. And yes, I know better. I should have hand washed it.

The solution:

I always said that once this sweater was in pieces, I would make up a pattern to make a new one. So here it is. I recently finished up my t-shirt pattern, a block pattern ready to go. I began by carefully laying out the sweater and positioning the front t-shirt pattern on top. I then used scraps of paper to note the differences between the sweater and the pattern. You can see my notes in the picture above.

The notes** usually say something like: Move SH pt out 1/2" (left arrow) ; or Extend hem (down arrow) 3 inches. These notes are sometimes accompanied with drawings as needed. If I was working in CAD, I would just mentally note the differences and make the changes as as I went along. Since I'm drafting with pencil and paper, the notes are essential.

The next step is to trace off the t-shirt pattern and start applying the changes. More on that later.

*There are a lot of pattern making myths out there. I'm trying to keep this blog entry very focused but I'm happy to answer pattern making questions and myths in future posts. Please leave your question or comment below.

**These notes eventually find their way to my pattern piece catalog. I assign a pattern piece number, note the style/pattern piece that the new piece came from, and then tell what changes were applied and any other relevant details. Blank forms for managing patterns are available in my Pattern Making bundle or in the book with complete instructions.

The blouse pattern revisited : recutting tagboard pieces

About a year ago I cut my blouse pattern out of tag board. I had cut the interior of the darts out because I thought it would be more convenient to just trace the dart onto the fabric. Sometimes this is done in the industry, but there is a better way. Anyway, this didn't work out very well.

So after I had made my most recent modifications, I recut the front and back blouse pattern pieces. This time I drew the darts in with the addition of drill holes. You can't really see them in the photo, but I used an awl to poke holes into the tag board. A pencil tip fits into the holes to mark the dart on the fabric. This should work better

Now I'm finally ready to buy some more fabric for blouses.

Understanding basic block patterns : a few definitions

Shari asked me some questions about basic block patterns.

So pleased I stumbled on you blog - wonderful work by the way!  I am keen to start designing kiddies clothing and I am trying to find block patterns and relevant information on using/adapting them, that is not too confusing.

I have got some info on-line and books out of the library but have not 
found anything that I am happy with.  I am wondering if you could give me any pointers on where to start looking and/or even purchasing basic block templates.

The first thing to do is to define the term block pattern. A block pattern is a finished pattern with all seam allowances, notches, notation, etc. The pattern has been tested and approved for fit. It has been used, perhaps, in a style that has proven to be acceptable with customers.

Developing a basic block pattern

A basic block pattern is a pattern from which all other styles are based. Sometimes they are derived from the original drafts created from body measurements with instructions from a pattern making manual. Sometimes not. A basic block pattern can also be the patterns from an approved style as described above.

Just as an example, we can look at my recent blouse making venture. After a bit of testing, the pattern pieces for that blouse have become my basic block patterns for future blouse styles. I cut them out of tag board so I can trace them off, either on fabric for cutting or on paper for drafting a new style. The pieces have seam allowances and notes to help for future construction.

Pattern makers in the industry do not draft from zero every season. We trace off existing pattern pieces (blocks) and modify them. Over time we create a library of pattern pieces that can be mixed and match for a variety of styles.

How to acquire basic block patterns

There is no easy way to acquire basic block patterns. These types of patterns are considered proprietary to the business that developed them so they are rarely for sell. That leaves new designers with a few options and none of them are easy. And perhaps, that is how it should be. I know that sounds harsh, but your patterns will be better if you struggle through the development process yourself. You will come to understand how things should fit and be sewn and know how your patterns work.

So what are the options?

1. Draft your own patterns from body measurements using a pattern making manual. This is the most time consuming option, but ultimately the only way to ensure the fit you want.

2. Hire a pattern maker to do it for you. Probably the most expensive option. You will need to be prepared with a basic style, body measurements, etc. Expect a bit of back and forth as you refine fit.

3. Adapting commercial sewing patterns*. You can buy a commercial sewing pattern for a similar style but it will require a bit of fixing - actually a lot. Commercial patterns are usually sloppy and are not production ready by any stretch. One exception are Burda patterns which do not have seam allowances, so they will be easier to fix and adapt. Burda has even released their patterns as "open source", which is actually a misnomer. In other words, Burda has released their patterns with the license to use the pattern as you wish. And lest you think that I am encouraging the violation of the copyrights of commercial patterns, please know that the copyright status of patterns are in a legal quandry. In other words, in the U.S. no one can stop you from using the patterns you purchase as you wish, even though many believe they can. The only way to avoid that mess and confusion is to draft your own patterns from scratch.

4. Buy block patterns from someone else. I've never seen any production ready patterns available for sale. That doesn't mean it will never happen. I've even considered selling mine, but I haven't done it yet.
BTW, my blouse patterns were adapted from some Burda patterns and it worked well for the most part. The collar pattern pieces required a lot of work and I still don't have them right, IMO.

*If you buy a commercial pattern to take to a professional pattern maker to fix, you will probably be turned down. Commercial patterns require a lot of work to fix and it is honestly easier to draft a pattern from scratch. Some may turn you down for ethical reasons. Others may turn you down because you may give the impression that you are not ready or prepared to be a professional. I probably would turn you down too. The only way I would use a commercial pattern from a client is as a reference to match fit and styling while using my own block patterns or drafting from scratch.