Figuring out how to use the new shape keys isn’t too hard. Gaia Clary has provided free help, which I link to below. Figuring out what you will do with them is another challenge. It looks to me like using shape keys will be most useful to those making clothes for Standard Sizes and custom sizes.
I don’t see the shape keys being particularly helpful for those making fitted mesh clothes. But, I’m not making clothes right now, so I haven’t worked with the shape keys. Continue reading