Linen/cotton blend maternity halter dress

Old Navy 60/40 linen cotton blend maternity dress. Inner lining 100% cotton. Elastic at back. 38” elastic to bottom hem 18” flat across at pits 23” across at 4” below elastic back / bustline. C/D cup. Please ask for further measurements as I’m not sure what to measure for maternity wear. New, never worn, non-smoking home.