Carhartt dungree style work well but not with every holster.
I see in your photo that you have a Mika holster. For me that has to much material at the bottom of the holster. This raises the 642 about 1/2 inch (maybe a little more) from the bottom of the pocket. The leather holster shown will perhaps let the revolver sit closer to the bottom. My solution is a Remora holster that I cut so my 642 barrel is at the very bottom of the holster almost touching the cloth of the pants pocket. My Remora is essentially an open bottom. I have not yet cut down my Mika holster but most likely will.

I am thinking of buying a few pair of pants that I like and finding a tailor to make my pockets deeper and of tougher cloth. That way every pocket hoslter would work. Also the 442 being black hide a little better than the 642. If you find a good solution please post back.

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Living on the great plains