You would need to hip and pit to pit measurements so advise you more accurately.
How to check if this outfit will fit you accurately:
We measure our garments by laying them flat down on the ground, and measuring it side to side, pit to pit. This is to ensure better accuracy when you compare our measurements with yours.
To check if size fits you accurately, lay a similar item you own flat on the ground and measure it from pit to pit, side to side and compare it with our sizes.
Do give a 0.5＂ allowance as dresses are mass produced so there could be slight variation to the sizes.
Hope this helps.