To bra or not to bra? That was the question at Paris fashion week.

Instagram models have been pushing back on push-ups as of late, and some designers are following suit.

At Thom Browne’s Sunday showing at Hôtel de Ville, scantily clad models walked the runway in sheer ensembles with crystal pasties and Marie Antoinette-inspired corset gowns with underwear motifs. (If that wasn’t enough cleavage for you, he also showed sculptural skirts that resembled a female bosom.)

Still, some haven’t given up on the undergarment.

Spanish label Loewe sent brassieres down the catwalk last week . . . strapped to the outside of dresses.

Meanwhile, French house Nina Ricci resurrected the “bullet bra” — the iconic cone-shaped brassiere from 1950s — in haute satin.

To the bare-busted and supported alike: bra-vo!