I believe these are British Military 1953 pattern Gurkhas shorts from 1957. great thick cotton. button fly.
Label: Shorts No.3 Dress Gurkhas 1953 Pattern (1957)
Measurements:
Waist: 29"
Hips: 46"
Length: 20"
Rise: 14"
Condition:
I soaked these but there's still a VERY faint hint of yellowing in some lighting. sold as found.