Holster slot/ belt width/pants loop width
All 3 must be taken into account.The belt needs to be at least close to as wide as the holster slots. Other wise the holster will tend to rock and squirm when you walk. A custom holster maker can make whatever you want but the mass produced holsters are usually 1 1/2" or 1 3/4". I would not go below a 1 1/4" belt. My first suit belt was an Alessi 1 1/4" and a bare "get by" on the width. The length shrank after a few years:wink: so when I needed another suit belt I went with a 1 1/2" Galco SB3.