[Solved] UV of an item is overlapping in blender

Hello! So I created a dress in marvelous designer 7, put it into blender (version 2.76) and it looked fine until i opened uv map! There all my dress pieces cover/overlap each other if you look at them in uv_1 option. That way i cannot even split them apart. It was that way before and after I added a modifier.
Before that both marvelous designer and blender worked ok, i did things there and uv was fine. The only thing that I added in marvelous designer were buttons... maybe that's the reason, but I don't know.
I used Sims 4 Studio (Wishes).