Insight tin rose strapless one piece

*RUNS VERY SMALL* This is a beautiful suit but it doesn't fit me or my 12 year old sister. We maybe tall but a size six (this is it's size) should fit us (i am a size 4/6 in other stuff and it doesn't fit me) it has cutouts on the stomach and comes with two removable straps. *Never been worn but has no original tag*