The Colt D-frames like the Detective Special, Cobra and Agent are pocketable in normal clothes--the two-inch K-frames, which are considerably larger, are not.
Without doing a lot of checking, I think the Taurus compact frames are probably the closest current production falling somewhere between the Colt D-frame and S&W K-frame. I had a five-shot .44 Special (discontinued) on that frame that was somewhat pocketable. So, the 617 seven-shot .357 Magnum is probably the closest you will get (and then your faced with whole Taurus quality issue--you have about a 50-50 chance of getting a usable specimen).
Your best bet is to haunt you local gun emporiums, gunsamerica.com, etc. and try to find you a DS, Cobra or Agent--there are number out there still are fairly reasonable prices, and the best thing about them is they won't depreciate.