Simplicity 5100 vintage sewing pattern, dated 1978.
Men's Pants in Proportioned Sizes:
The pants with fly front zipper closing have waistband, top-stitched side pockets, back welt pockets and optional self fabric carriers and purchased belt.
Waist 34 inches / 87 cm
Hip 41 inches / 104 cm
Pattern is partly cut and checked complete. Envelope is in good vintage condition, with some handwriting on the front.
More men's patterns here: