Lundi sundress white s/xs lots of crochet details

Beautiful sundress or bathing suit cover up. Labelled size 4 but seems smaller. 13” across under bust. Maybe for a 32A or 32B?. The dress is at least 50” long, from the top of the bodice to the bottom hem. Halter style top and has a second tie fastening in the front. Never worn (much too small!). Lots of crochet details. Rayon with cotton bodice lining. Zips up left side.