There needs to be a tag for this type of bra.

Strapless bra. Wait... those still have a strap around the back...

How do these even work?

well this kind of this exist
dont know how the hell they stay on
but exist

Well, IRL they use glue. But that's kind of a killjoy, so we'll say "wishful thinking".

Looking under the "Strapless_Bra" tag, the only other image has a bra exactly like this... While it might not be the most accurate description, maybe just use that...?

It's called "adhesive bra"
And they are more suited for smaller breasts.

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i like what i see there