Vintage Black Leather Moto Jacket Slim Fit XS S

This is from my vintage shop in Paris, so I don’t know much about the brand except that it’s a Spanish designer. The tag says S, but it was sold to me as an extra small and I think that’s a truer descriptor. I’m 36-37” in the chest and cannot do it up anymore! Otherwise it’s a flattering jacket. Made from lambs leather. Waist: approx 15.5” flat Under armpits: approx 17” flat Arms: approx 25” long