ASOS White Bathing Suit Swim Top

ASOS White Bathing Suit Swim Top Measurements taken while laying flat 13.5” Across the bottom 11.5” Long It is Small, I’m a D and this was too small for me, so I don’t understand the size on the tag. No stains, rips or holes. Elastic is still in good condition. Great preowned condition, tried on once, didn’t fit. SS