Dress belts should have a few inches of leather to the left of the buckle once it’s fastened. Enough to tuck under your first belt loop, or the loop on the belt if it has one, is a good rule of thumb. Err on the side of shortness if you need to, rather than wrapping a long tail of leather around your hip a second time. Casual belts have a little more room for flexibility, but an overly long tail end is always an awkward look.
Certain types of casual cloth bands have square brass buckles and a brass cap on the other end to feed through the mechanism. Military surplus stores often have these, and other manufacturers have imitated the style as well. These are traditionally worn “brass on brass,” with no spare belt beyond the buckle once fastened. Since the belt is cloth, you can remove the buckle and trim the cloth down until it’s the right length, then clip the buckle back into place.
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