Not sure if you mean a belt (goes directly on your trousers) or suspenders (these go over your shoulders and hold the pants up by use of a pair of clips or buttons).
They are called suspenders, straps or a belt.
Straps that hold up your pants are called suspenders, straps, or belts.
If I'm thinking correctly, BELT is a four letter word, and it holds up your pants :)
Suspenders.
the pole that holds up the sail is called the mast
fancy pants
overall.
an easel
Pants are typically held up by a combination of a waistband, which fits snugly around the waist, and fasteners like buttons, zippers, or hooks. Additionally, belts can be worn to provide extra support and keep the pants in place. Some pants also feature elastic bands or drawstrings for added security and comfort.
The 7 Islands in the Pacific we've won Okinawa, Guam, Tarawa, Iwo Jima ect
Filament.
Gun rack