I made a piece of custom apparel a few days ago, and now I've realized stupidly I should have just taken the time to convert it to all bases. There is currently no way to do this though. I feel like it should be possible to submit more bases to an already made design. They could go through the same approval process as a new piece of apparel. I feel this will become especially useful once more breeds are added. What's on all bases now won't be on all bases in the next few years, which will be a pain to people who create custom apparel.