Tried 'em all, leather and Kydex. Check (search) here and Park Cities Tactical for LOTS of discussion.
The very best OWB holsters for the P7 are:
Matt Del Fatti's LP-QS (http://www.delfatti.com/)
Lou Alessi's CQC/S
Ken Null's GSS (Gibraltar Speed Scabbard).
They all work well, though they are each best worn in slightly different locations, and at slightly different cants. The Del Fatti I have is at a 10 degree cant, worn just barely behind the point of the hip. The Alessi holster sits a bit farther back, and has a 15 degree cant. Ken Null's GSS has the most radical cant (almost 30 degrees), and is worn almost over the rear "hip pocket". "You pays your money and you takes your choice."
The Del fatti offers an almost-vertical draw, while the others require a slight "break" of the wrist to draw.
All three makers know their stuff, and are truly Master holstermakers, unlike some of the Journeyman guys out there (no names, at least not on a public forum) who don't really know how to make a holster that will properly balance and conceal this odd, butt-heavy, short-framed little gun, but will still be willing to try, at your expense.
No foolin'. I wouldn't steer you wrong.