A lot depends, Callie, on how accurate you want your texture to look on the figure. The simplest approach is to go into the material room (adv tab), create a new imageMap node. So, select your item and your material zone, then:

right-click on the material room floor and from the pop-up menu select
New Node ->
2D Texture ->
image_map

Connect this to the Diffuse_Color channel of your big PoserSurface node (the top channel). Then, in that imageMap node, for the Image_Source channel, find your texture.

You will find that the resulting render is fairly unsatisfactory.

Have a look in your runtime:textures folder... find a clothing item you like and check out what the developer did. He or she probably created an image (textureMap) to fit onto the clothing. See if the item you wish to texture has a UVMap... if not, you can make one with UVMapper by Steve Cox. Use this as your template for your clothing texture.

I've been playing with Kamilche's Stitch Witch, which does a very slick job of making textures for clothing. It's a bargain if you want to do this more than just casually...

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks