We've said it before and we'll say it again - we love clever.
The Bra Barrette is the genius idea of a school teacher who was tired of fixing her bra straps all the time. (Or from suffering from FBSS - Falling Bra Straps Syndrome - as she calls it.) After taking a paperclip, twisting it and using it to hold her straps in place across her back, she knew she was on to something.
We think the Bra Barrette is a great idea to wear under Mitzvah attire. Nothing like "adjusting" yourself in public when you're all gussied up!