See-through blouses

I had always wanted to make clothes from thin cloth, which allows you to see a bit of what lies beneath. You know, like those white blouses made from thin cotton cloth. Well, today, I got down to it, using GIMP, editing the layer mask. When editing layer mask, white is opaque, black is transparent. What I did was set the white portions to light gray instead, so that the result is a slightly transparent blouse. The blouses come in white, pink, cyan and yellow.