Yellow top (5x? 6x? 30in wide)

selling a top I bought for my plus size gal pal that was way too big on her, it has loops for bra straps (pictured) a zipper up side (pictured) measures 30in wide in bust and length, unsure if this is a 5x, 6x etc? I tried googling but had trouble finding what it equated to. it is brand new, unbranded, unused, but no tags, wash cold gentle cycle. listing NWT as it is new but didn't come with tags, however buyer will need their own bra straps as this did not come with any.