it's really cool that custom apparel can be uploaded once and fit any base, if the artist has put all the files in. however, that's an awful lot of work to do before submitting a piece; right now, there are 6 breeds, two poses each, so that's 12 pieces of individual art that needs to be done if an artist wants to accomodate ALL breeds and poses. now, yes, you don't have to accommodate all of them, but personally i would like to! and many artists already have. so it's clear people would like do this if possible.
additionally, there will almost certainly be a need for this down the line. i assume new breeds might be added in the future, and with a new breed comes a bunch of custom apparel that will suddenly be lacking. do artists then have to buy another custom token and upload a new ‘design' each time this happens? that feels counter to the idea of custom apparel and the way it is designed.
tldr: this system is great, so let's future proof it!