Vintage YSL Trousers 1970s

Vintage YSL Trousers. Lightweight linen plaid tweed fabric. Pants are ankle length. No size tags on pants but will fit size 0 or 2. Bought at a vintage fair and unfortunately too small for me. There is a slight discoloring on the right leg that I didn’t notice until I took photos - please see pic 3. I believe these are circa 1970s or late 60s based on lining and logo print. Made in France. Original buttons intact. 2 side pockets and one back flap pocket