I have a vague memory, either on a skirt I saw or something in a book of a back vent on a skirt being reinforced with a small piece of leather, I think a triangle but I'm not sure which way up.
Anyone encountered this and know what it was like?
I've added flanges onto the bottom of my current pair of trousers and made them with side splits, but as they were added afterwards its not super neat. I thought I might sew little leather tabs at the top of the splits but was wondering the best shape.