The holster I used for my UC1 Drake was one I'd made for another costume (recycling FTW!), but it only cost about $3 in scrap leather and Chicago screws, a little glue, and about two hours' work. If I were going to make Drake's model, I would probably invest in some heavier-weight leather to be more accurate (or at least double-layer the thinner material and stitch it).
Holster alone:
Riza's shoulder holster | Photo by AVAAntares | Cosplay.com
On Drake:
Nathan Drake | Photo by AVAAntares | Cosplay.com
Thanks for your help. I ended up going with a holster (molded) I found on Amazon for 30 dollars. Unfortunately, it only ended up having one leather shoulder strap (the other strap was nylon). However, using the leather scrap idea, I made a identical leather strap to put over the nylon and it came out great.
Here are all the pieces I got for my costume:
THE HOLSTER
This was the holster I mentioned getting off eBay. The holster part I was able to make vertical, and as mentioned before, I made a duplicate leather strap to cover up the nylon strap. Came out really well and was able to use some extra pieces that were included with the holster (extra screws, bolts, fasteners) to make the cover strap look authentic.
THE HIP BAG
This was posted earlier in the thread, and I went and bought it from the eBay seller linked. The only issue with this was it was a really bright tan vinyl pack. I went over it with my knife, a lighter, and smudge it with dry erase markers for a couple days and I think it came out really well.
THE SHIRTS
GAP Slub Waffle-Knit Henley
Hanes Cool DRI® Performance Men's Long-Sleeve T-Shirt
The waffle-knit shirt is perfect. Perfect color, perfect texture. It's a lot more green when you actually get it, as opposed to the brown you see in the preview image. Went over it with a spray bottle of dirt and rolled around alot to weather it (think I when a little over board though...oh well).
The white shirt is good. I didn't realize it was made of polyester. Rubbed the exposed parts with some baseball diamond dirt to rough it up. Came out nice.
THE SHOES
Pampa Hi Lite Leather
Much like what TrentPraeger said, I wanted to be able to use the costume pieces when I'm done with them for normal wear. Also, while Nate wears sneakers in the game, I feel like he'd wear boots in real life. These boots had a nice rough color to them and look like they've already been well worn.
THE BELT
I used the UC3 buckle that came with the collector's edition (you can purchase one of Amazon). The belt I bought off Amazon. Just look up distressed belts and pick the one that works best for you.
The necklace and ring I also just used from my copy of the UC3 collector's edition. Looks nice, and works well.
For the jeans, I just used an old worn pair I had. Rolled in the dirt and applied some prop dirt to the knee areas to really get a "been crawling through the mud" look akin to this picture:
As for the gun, I've got choices:
Nate picks up a lot of guns during the game. I don't feel the need to be screen accurate for this one.
I'll add some pictures of me in costume once I get some pictures of it taken.