Help with Avatar Catalog API

I am working on a commission in which I am creating a catalog UI. The commissioner wants to include layered clothing in the UI, however, documentation for this new clothing is quite scarce. I have two things I need assistance with.

  1. How should I go about sorting “Classic Clothing” (as Roblox has deemed it) from layered clothing when searching the avatar catalog. Currently, layered clothing shows mixed in with classic clothing, and I have not been able to find a way to search specifically classic clothing, only specific types of classic clothing (which is not useful because I want to include all types on each page, and though I could use multiple searches and then mix them together, this is a very hacky method that I would like to avoid).
    Example of layered clothing being mixed with classic clothing (the black layered jacket in the bottom right):

  2. What is the proper API endpoint for layered clothing? I am currently using Category=16 as the Catalog API claims this is the proper endpoint for layered clothing, however, it returns a 400.
    Current result of trying to get layered clothing:


    List of categorys according to Catalog API:
    image

If anyone can help me with either of these, it would be much appreciated.