Hey there, I need some help.

I have a Kung-Fu styled shirt that was made in Marvelous Designer that I imported into Character Creator, and I'm trying to create soft cloth physics so it drapes naturally on my character when I animate him in Iclone. The problem is that I can't create my weight map because the UV reference is too zoomed in, and I can't for the life of me figure out how to make it make so that I can see the entire UV map. Can anyone help me?
The editor I'm using is GIMP btw.