WARNING! This blog post contains photo and/or words that may be offensive to minors. Please do not read this with a kid beside you. In case the kid has already read this, carefully explain the proper use of underwear--bra for that matter.
Photo from frankyvoigt.
Under normal circumstances--meaning, you are not acting a whore's role in a movie or play--you should not let your bra peek out of your clothes... unless your shirt is sewn with the bra in front. I don't know what it is with some female celebrities who find happiness wearing clothes that shows off their bras. It is a NO in any angle no matter how expensive your bra is.