I would never wear something with a horizontal line to it on my derierre - just makes it look too wide. If you can envision the model w/o the headlights, she's got a tiny little tush, but w/the tail lights, they make it look wider. Nope, I wouldn't wear those. I never wore panties with tight pants - wore pantyhose only, so no lines - just gotta make real sure you're all zipped up securely b4 exiting the ladies room, especially when you go clubbing and have a couple of drinks in you.
