FASHION NOVA ADVICE PLEASE

I recently started shopping at fashion nova and i ordered a few items in a medium and a few large items I like the way they fit it just depends on the item...jeans I can fit a 7 but they are snug thinking I could probably go with a 9. I ordered a romper in a large because my thighs are big but it doesn’t fit in the boob area😒 any tips to fix this? This is the romper it has some kind of “bone” material in the V cut. Same V cut and material in the back.