Vintage 60s? Jack Winter "The Pants that Really Fit" Blue Denim Lace-Up Pants

Condition: Vintage; cord ties show some yellowing near edges (see photos). No tags with size or fabric info. Has some wear between legs (see photo). No other issues. Size: Unmarked; please check measurements. Style: Unusual vintage denim pants with lace-up rope cords at outer side legs and hips. Please note these are unlined, and it is open under cords. I'm not certain of the age of these; my best guess is from the late 50s or 60s. Color: Blue Materials: Unknown Measurements (approximate, with sides of fabric flush) Waist: 12" across Hips: 16" across Rise: 11" Inseam: 24.5" Leg opening at cuff: 5.75" across *HC20