Panties 24/7 for the last three years. Cami or full slip (just tuck it into your pants) with no problem under my shirts. Just be aware of spagetti straps, they show up. But as I said, I just tuck my full slip into my pants. No problems with bunching and you don't have to worry about something sticking out from the bottom of your shirt. Never a bra without forms. What's the use?