Not to run this topic into the ground, but we are generally incorrect in what we believe people see.

1. Most people are not paying any attention to you in the first place.

2. They would have to be right underneath and looking straight up (maybe with a flashlight).

3. It's dark up there.

4. Unless you're walking bow-legged with a spotlight on your crotch they won't see anything more than a bit of thigh.

5. Wearing anything other than dark bikini briefs will only draw attention to that area and make you look ridiculous.

6. If someone wants to learn the nature of your under-vesture, they will, but that's a far cry from "flashing." Discerning whether or not there be any undwear up there and actually seeing the family jewels is a very different matter. Just keep you legs together and walk with poise (I know, men don't usually learn those skills growing up!) and nobody's gonna see nuthin'

Relax and enjoy life!