This is a very old pants. 136-years-old pair of Levi's pants found in the goldmine.
No belt loops were used on the pairs, just a few button around the waist to attach the suspenders as it was the popular and preferred method of keeping the pants up in the late 19th century. It also used a cinch at the back for adjustable size.
The pair were kept safe in Levi Strauss & Co. Archives in their headquarters in San Francisco.