I skipped a lot of this thread, but I wanted to put a couple things out there.
First, don't get a nice stethy yet. At most I would get a Littman II or something, but you can wait until at least 4th year to get the fancy one. It won't make a difference in the meantime. That way, you can decide what you like, what tube length, what color, etc. and then spend the money later. Just get something cheap now (even a $20 special would be okay for now) or maybe borrow one if you can.
Specifically for
@cdoconn and other OkSUers - you won't need any sort of special pants or shoes just yet as long as you have *something* that makes sense for barn work, which could be tennis shoes or something like that. You'll get a white coat during the white coat ceremony. Some keep those for 4th year, but I wouldn't. Reason being - uhh, I gained like 20lb during the first three years. So you don't know if they will fit. Plus I liked picking a specific brand for 4th year since that when you wear them daily. So use it for the labs you need a white coat in, plus maybe get a cheap cheap cheap one for anatomy lab... because it will stink forever after two semesters of that. You won't want it after. So go cheap.
You'll want a couple pairs of scrubs to wash and wear often for anatomy lab. You'll want a pair of rubber boots for equine anatomy lab, at least for certain parts of the dissection process. You'll also need a few tools - scalpel handle, hemostats, forceps? I think that's all. Label them well.
Notebooks, three ring binders, pens. Plan to buy more as you realize what you want to do to study. Dry erase board? Colored pencils? You'll need to buy Millers or find someone to borrow it from, because you'll just want your own copy. It will get juicy and disgusting. Be aware. Maybe photocopy pages in advance... or just acknowledge that it will get nasty. You'll also have to purchase the horse anatomy book, but with Lish leaving, I don't know how that will work.
I agree about setting aside some cash for shirts... and sweatpants... and license plate frames, and car stickers... and mugs... and hats, and belt buckles, and hoodies, and and and. Set aside like $100 and don't buy the first thing that they pass around a sign up for just because it's there - there are gonna be LOTS of things.