UV 1 issue (i think)

im guessing what you did was trying to fit all of the black on blender, but i don't really see any problem. are you looking to add texture to your bottoms? if so, you don't do that in blender.


click new, or the plus button on the uv bar thing, then type in 2048 x 4096




after that, go to render and and bake



then save it as an image




and edit

the reason why it's black and not completely textured is because you must've added something on the inside of the pants. generally, the inside of any mesh isn't textured. so i'm guessing you must've done something so that it was??? but if you really did add texture to the inside, had you not, there would be a texture showing up. idk how to fix that. im sure there's a way lol

sorry if this isn't what you wanted