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I've got a couple of Beltman belts without stiffeners and they're more than up to the task of supporting full size 1911's without sag.

I often use non stiffened belts from The Wilderness for casual wear.

Keep in mind that stiffened belts are, well, stiff - they can be hard to thread through pancake style holster slots in a way that won't be uncomfortable. They work best will belt loops.