3 and 4" 624s in the original (Gould and Goodrich) 624 holster
and the Mernickle previously mentioned. Both of these lay flat
on the waist and let the belt straight through without much bending.
I have tried (and returned) several pancake holsters that required
the belt to do some serious belly dancing to do its job.
These holsters you can wear the belt in its normal hole on the
buckle.
The Mernickle is an interesting and unique holster in that it is
the outer 3/4 of a duty holster sewn onto the back panel of a
pancake. It works wonders. Very comfortable. It also fits my
Mountain Revolver.
I use a Galco SB-5 1.75" belt. About the most belt you can fit in a
pair of jeans. Recommended.
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Nemo