Currently the custom apparel shop is sorted by default from oldest to newest, so the very first pieces of apparel that were created always appear at the top of the list. We're not very far into the game yet, so this isn't much of an issue - but as more and more custom apparel is made it will make it harder for newer pieces to get seen as they disappear down an ever longer list.
So I suggest that custom apparel is sorted by newest first to give new apparel and artists their ‘15 minutes of fame’ so to speak, and make it easy to quickly browse what's been recently added for the day without having to go all the way to the bottom of the list.
Alternatively, it would be nice if one of the filters just had a ‘sort by newest’ option so you can choose what order you'd like to browse by yourself.