Zara denim strapless romper

this is an EXACT dupe of the zara denim strapless romper that’s sold out - purchased this from a boutique called revenge the label for $55. still in packaging only tried on - RUNS VERY SMALL. i’m a size 4 for reference and ordered a large and it’s still too small. would fit a 2 best or size small. sooo cute just too small.