Monnalisa dresses

Purchased on Poshmark and a wonderful buy. In VGUC. Special occasion dresses. Labeled 18 month ( ran a little shorter than I’d like on my tallish daughter. I would say 12-18 month might be more true). Did not notice this until the time of this post but the white dress has a little clear button where I presume a little attachment (left shoulder) was but I never even noticed it was missing.