I have Detective Special. They are great guns, and the Cobra, as far as I know, is just the light-weight version) (
http://www.gunsandammomag.com/classics/ct0507/)
I either IWB mine in a Clipdraw in the summer, ( You'd use "Universal Clipdraw for your Colt:
http://www.clipdraw.com/) or other times an Alessi Talon or Talon Plus. These are superb, thin, molded to the gun, stiffened leather that retains its shape and needs no hammer-retainer. Only problem is the often long wait to have it made. I live in area where Alessi has his shop, and bought two that were ready to go (the other for a Colt Python). Here's a website for info and ordering, the shop has no website, he has no need of one, always busy...
http://www.rfholsters.com/rfholsters/dept.asp?dept_id=10
Here's his shop number, maybe he'll have one in stock: (716) 691-5615
They are $60 by the way, worth every penny and more.