I have done it before, a while ago. The dodge brush is the correct way to go. I made one for Judy, back in the day, and wasn't happy enuf to release it. The tan lines looked good, but the pain was getting it to run across the seams. I wound up fading it almost completely out at the seam, where I couldn't get it to line up. One thing I did, was I put the bikini for Judy on Judy and rendered her off direct line of site from front and back cams, then used the resulting renders to make masks for using the dodge tool. This way, the tan lines and the bikini were the same. (So she didn't have tan lines running out from beneath the bikini when she had it on.) Since V3 is UV'd in completly different way, I think the seams wouldn't be nearly as big an issue, since there are not two "side" seams. I don't think that using a render to make a mask would work there.