Reduction in Width for Stretch Blocks

knit sloper SF

As is my custom, before I started drafting a stretch/knit block for myself, I did a lot of research.  I looked at a number of textbooks (not just one), watched as many different video tutorials as I could, and then looked online to see if I could find anything else; blogs, Youtube vidoes,  or any other textbooks. I then collated and that information to see what hte difference were.  I also made some blocks to different methods and compared them.

I found, also as usual,  that there is always some difference between different methods and different authors.  Most textbooks use stretch and knit interchangeable, and that was confusing when it came to stretchwovens. 

Most textbooks that I have or have seen deal mainly with patternmaking for woven, and contain one chapter on Stretch/Knits, and the information supplied didn't seem comprehensive.  I did eventually come across a thick textbook of 500 pages for patternmaking purely for knits.  It stated that it was using Industry Standards, whereas some tutorials  I watched have said there are no Industry Standards when it comes to Stretch.

I'm not going to give you definitive answers for exactly how much reduction to apply to your Block,  but I will summarise what I have found,  tell you what worked for me, and give you suggestions of where to start.  

You really need make your own toiles and determine yourself what is good for you; everyone has different tastes in terms of what is comfortable and how tight they want their stretch garments to be.

Reduction in Width

 In a nutshell, these seem to be the Industry Standards for the measurements used to draft Knit Blocks:

  • Stable Knits (Knits that stretch 18-25%):  Reduction of 2%, or 98% of the body measurements
  • Moderate Knits (knits ch 26-50%): Reducttion of 3%, or 97% of the body measurements
  • Stretch Knits (knits that stretch 51-75%): Reduction of 5% of the body measurements
  • Stretchy Knits (knits that stretch 76-100%): Reduction of 10% of the body measurements

These are the amounts that I got from a textbook specifically for knits.  The textbook gave instructions for drafting knit blocks directly from measurements (i.e. not drafting it from another block), and those measurements were body measurements with no ease added.

Some patternmaking books and tutorials I've seen start with the Torso Block (which has some ease) and reduce that by 2%, 3%, 5%....  I've also watched some tutorials where the instructor stated the above standards of 2%, 3%, 5% reduction, but she was applying them to commerical patterns, which may have even more ease than the block.

In effect, if you choose to use the reduction that are stated in the textbook, this means:

  • Stable Knits are made to exactly your body measurements
  • All the other knits are made with Negative Ease; 97%, 95% & 90% of your body measurements.

Note that the above doesn't apply to Stretchwovens; even the textbook on Knits said something vague like "the normal Torso Block should be used, but some reduction in the width is needed". 

My Recommendation: From Torso Block to Stretchwoven Block

To draft your Stretchwoven Block, reduce your Block by 2%. 

I always prefer to test sleeveless garments first for testing fit (why add the extra work of the extra element of the sleeve?) so the Sleeveless Stretchwoven Torso is the first Stretch Block I created, and it fit well.

Note the changes made to the Torso Block to crate the Sleeveless Torso Block:

  • Reduction in width of about 1/4 inch
  • Armhole Raised 1/2 inch

My point here is: if you make changes to your Torso Block (with Sleeve) to create a Stretchwoven Block (with Sleeve), and then you want to draft sleeveless garments, you may want to try reducing  reduce your Stretchwoven Block and raise the armhole again.  

My Recommendation: From Stretchwoven to Knit

First try reducing your Block Measurements and testing that. If it's far too big, remake your blocks using percentages of your body measurements, as above.

Once you've done the main work in creating your first Knit Block, it's not that difficult to make the further changes; i.e. it is a case of redrawing the side seam line.

 

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How come I have books that say the same reduction but then I’ve read other stuff that say use .9 for 10%, .8 for 20% and so on? I dont get why they use such little percentage. Is it because they make clothes bigger? Or are you suppose to deduce...

How come I have books that say the same reduction but then I’ve read other stuff that say use .9 for 10%, .8 for 20% and so on? I dont get why they use such little percentage. Is it because they make clothes bigger? Or are you suppose to deduce the whole entire pattern some now by .98, .96 ect. What am I missing? Lol

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Sierra
This comment was minimized by the moderator on the site

Hello Sierra,

The amounts I'm giving is from the Kenneth Richardson textbook, which is the one I learned from, however most of the other figures I've seen in other textbooks and from reliable sources say pretty much the same thing, maybe a...

Hello Sierra,

The amounts I'm giving is from the Kenneth Richardson textbook, which is the one I learned from, however most of the other figures I've seen in other textbooks and from reliable sources say pretty much the same thing, maybe a little more or less.

Firstly I want to make clarify what you are saying... Am I understanding correctly that you have seen textbooks giving directions to use 90% of the body measurement if the fabric has 10% stretch? And 80% of the body measurement if the fabric has 20% stretch? This really doesn't make sense to me... does that mean if the fabric stretches 100% that you reduce your body measurement to zero? If you continue that logic, that would be the conclusion, which is obviously absurd.

You do not stretch the fabric to it's maximum stretch - this would put too much stress on the fabric and the garment wouldn't last very long. Part of the reason for the stretch is for the comfort that stretch fabric provides, and stretching it to it's maximum from the beginning isn't desirable for a range of reasons.

As for the actual amounts - why 2% for stable knits that stretch 18-25%, etc... I can only surmise that the garment production industry tested fabrics at some point and this was the ideal amount according to that testing.

You can always try different amounts and see if they work, but I really cannot see that reducing your body measurement by the amount of stretch in the fabric will work. Even though garments with stretch have 'negative ease', you still do basically need ease for comfort, and that is what you get with the different between your body measurement and the amount of stretch in the fabric.

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Comment was last edited about 3 months ago by Maria Maria
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