The thought of showing even a strap years ago would have been down right unseemly.
And yet with half the female celebrities wearing mostly leotards and often much less, is a glimpse of the bra even worth mentioning?
How many of you have worn low slung vests a la Kendall Jenner?
The festival look is barely complete without some sort of bandeaux or bralet.
So where do you draw the line?
Some celebs show us just how they feel about the debate - who's got the exposure levels right and who should just put it away?
The Dos and Don't of showing your bra
THE LEATHER TREND: CELEBRITY DOS AND DON'TS
CELEBRITY TREND: THIGH-HIGH BOOTS
MORE CELEBRITY FASHION