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Best bet is to measure your current belt, follow instructions on the web sites, they all have them. My old belt was not a gun belt so I measured from the hole I used and added 2" for carrying my .45 IWB to be safe. 2" was too much so the belt is a little long but it's fine, I still have one hole left if I wear it without a gun. If I lose weight (hopefully) I can always have another hole or two put in it. For me it's like this:
Jeans = 38
Dress pants/khakis = 40
Old non-gun belt = 42
New gun belt should have been = 43 (44 is ok but a tad large).
http://www.shottist.com/ Had my Andy belt over 7 years still works daily.
Been wearing the same belt for nearly 20 years now almost daily.
Made by Mitch Rosen in New Hampshire. Not cheap, but this is quality that lasts. Having a 100% brass buckle is nice when flying too. Never had it trip a metal detector.
Mitch Rosen Belts
This, I have one for regular wear and winter OWC, and a longer one for IWC summer. Infinite adjustment is valuable for when I have a little too much pizza.....5.11 Tactical Trainer 1 1/2-Inch Belt. Very stiff with a stainless steel buckle and velcro