Colorful belt straps. These straps are 1-1/2" wide and genuine or PU leather except for "clear".
These straps are a great value starting at $4.25. More belts with removable buckles may be found in "heavy leather". Basic black, brown, tan and white straps are here.
About sizing: The size strap you want will depend on the size of buckle put on the belt. That is, less belt is needed for longer buckles. Size choices for the straps are the actual length of the strap from base to middle belt hole. The middle belt hole is about 6 inches from the tip of the belt.