personally i wouldn’t wear a brown/black combo! I think it could look nice with the brown mini and a cream colored sweater or even any color (orange, pink, green, yellow). As loud of a print as it is, leopard is actually pretty neutral and goes with a lot of different colors!
Personally I wear tan more because it goes with everything and for some reason I don’t gravitate towards black shoes!
I think an XS would fit! Most of my friends who wear about 00-4 wear the XS!