How do i import a UV map and object into an existing piece of clothing (or create a new one)?

[Dogo]

Hi i've made many surface level questions in this community before, now i wanted to know how to edit a UV map and object from the material maker to turn them into a piece of clothing, or create a new piece of clothing for the game. The idea essentially is turning an object from KK studio into a piece of clothing for the character maker. The KK studio object in question would be this:

I want to turn this into a top, so its arms and legs can still follow animations in KK studio.
do i need to download a separate app to turn this into clothes? if so which? i am clueless in this stuff but im willing to learn how to do it.