I have a question for you ladies who only wear matching bra-and-panty sets: what is your approach if you want to wear white on the bottom and a dark top? Do you make an exception and mix a dark bra with light panties? Or do you wear a nude bra and panty set, and not worry about it if your bra strap peeks out (or of your nude bra shows through your black top, which can also happen, depending on the fabric)?
I don't normally wear white pants, but I have two pairs of white shorts and I mostly wear them with black tops. A black top requires a black bra, and white pants -- even if they are made of thick fabric -- usually require light-coloured underpants.
This is purely a question of interest, as I don't own any matching bra and panty sets.