Here are two strapless bras from Victoria’s Secret, both size 34B. Both are older styles, discontinued several years ago. Both have loops allowing attachment of straps if desired.
The first bra has pockets in the lightly padded underwired cups for placement of optional pushup pads.
The other bra has seamless, unlined cups of a fairly heavy material. Both have silicone strips along the upper and lower edges of the wings to help them stay in place.