Just bought a Sig 365 with thumb safety from Bass Pro for $499 and I'm wanting a leather inside the waistband holster for it. I know most people use Kydex and they are thinner and sweat resistant but I've just never warmed up to them. They seem to be harder on the finish and I just have always liked leather and I don't sweat much so was wanting something leather with a belt clip that was as thin and comfortable as possible, any recommendations?

I use the base holsters, like Mister Softy, from High Noon Holsters for my firearms. Thin and comfortable, and they stay in place.

Milt Sparks has Summer Specials available for shipping on their website. Milt Sparks Summer Special is a great holster.

I was going to suggest the Side Guard Holsters Minimalist Clip holster, which is thin leather with a clip, but his gun availability list doesn't include the 365. Of course, the list may be out-of-date, so it may be worth contacting them to see. FWIW, I consider their gear to be very high quality and a very good value; I've used their Quick Clip IWB holster (same as the Minimalist, but with a reinforced mouth) with my 642 for several years and it's still going strong.

If you're ok with snap loops, I'd suggest looking into TT Gunleather. They make very good, high quality gear, and usually have a pretty good turnaround time for a custom maker. I have their reinforced Mike's Special IWB holster for my Beretta PX4 Compact. While I don't use it much, it is fairly thin, and if you get one of their non-reinforced models, it'd be even thinner.

I've never been able to get comfortable with IWB holsters, but I've thought about the N82 holsters manly because I want something comfortable against my bare skin. I hate wearing two shirts.

Check out the Don Hume H715-M WCS inside the pants holster for your Sig 365. It is a winner! Quality craftsmanship at an affordable price. See the link at the bottom.

I own several which I use for my EDC rotation pistols. They wear well and look nice even after years of service.

The holster is made with lightweight leather molded to the specific model and reinforced at the mouth for sure reholstering. It has a 1.75-inch clip and a neutral cant so it can be worn in a variety of positions inside your pants.

H715-M WCS-INSIDE THE PANT HOLSTER [H715-M WCS] - $46.35 : Don Hume Leathergoods, Simply the Best!

I have been very pleased with the Milt Sparks Versa-Max II. I've purchased two so far for different pistols. Here's a link to their web page: Versa Max 2 | Milt Sparks Holsters

I recommend paying the extra $7 for the magnetic loops. This holster takes 18-24 weeks from the time you place your order, but it's worth the wait. Very comfortable, good concealment and very well made.

Try MTR Leather

__________________
Is that a gun No a lifesaver

I like the Kusiak Leather Signature IWB holsters for small autos.

Another vote for Milt Sparks Versa Max. It is well worth the wait.