Vintage floral Y2K dress, exposed back zipper, marked L but fits like S

Knit polyester/spandex fabric printed with bright flowers. Diagonal neck darts. Exposed metal zipper in back. Mannequin’s measurements are 34/26/36, with a B cup. The dress is marked L, but fits much smaller. (I'm size 4.) Due to the measurements below and the way it fits me, I'm listing it as S. Pit to pit 17 1/8” Waist 14 3/4” Hips 18 1/2” The fabric has stretch. Center back length 31 1/2” Excellent gently used condition. From a smoke free and pet free home.