If it still works the same after the 1.6 update.
You need the exact name(string) of the clothing.
There should be an action that returns a string array of available clothing.
Maybe, MCS Get All Clothing.
Let me know if you still have trouble.
I am working with UMA again!
https://youtu.be/wetb2HYLzDYI would be more than glad to help with some UMA actions, but I can't help much with the new mcs.
Thanks