Just a note - the multisize feature is hardcoded in the pattern format and relates only to men’s sizes from a Russian patternmaking book. So… needless to say the architecture of this feature must be ripped out and started again from scratch. The way this should work is completely different than the way it currently works.
So I advise against publishing info about Seamly multisize because it’s so crazy wrong and confusing. Many people who use Seamly are learning Seamly at the same time that they’re learning patternmaking. Teaching our current horrible multisize feature will teach them something they have to unlearn, which is harder than learning it to begin with. The concepts they will need to know about properly creating multisized patterns will be forever messed up. Just my two cents on this issue …
ANd any patterns made with multisize at this time might not be supported in the future because we can’t map a set of contradictory rules based on false assumptions that users have to “work around” to get it to meet their needs (current Seamly multisize) over to a set of logical rules (future Seamly multisize). So use the current multisize feature with this in mind.
If at all possible please, I beg you, wait for the fix for multisize feature. In the meantime just create a measurement file for each of your sizes. We will be able to convert all of those measurement files into a single multisize file, that’s doable. Can’t say that we will be able to guarantee conversion upgrade of a pattern that has the incorrect multisize feature embedded in it.