Anthropologie Brown Leather Lamb Muubaa Biker Moto Jacket 6

This jacket is a size 6 and tight on me (fits okay worn open) but snug for sure. Fits like an XS or 0-2, in my opinion (I’m 5’9, 133 pounds for reference). I saw someone list it as a “UK 6, US 2, XS” so maybe it’s just different sizing. Bought it awhile ago! Vintage Lamb Leather style Moto / Biker jacket originally from Anthropologie.