JPLegacy (now
Jurassic-Pedia ) used to have a complete guide put together by one of our staff members who is a 501st member. I've been (slowly) converting them into our new Encyclopedia, but I haven't gotten to the Park Vet guide, yet. I recall this one was a popular costume, and this may just be the kick in the ass I need to finally get to doing it.
Anyway, here's a quick introduction based on the backups in my archives:
Shirt: basic safari shirt. Close matches can be bought at Cabelas or Bass Pro Shop. White undershirt
Pants are dark blue slacks.
Boots are brown galoshes, it appears.
The cap is probably the hardest thing you'll find. I've yet to find one like it. It's forest green with a brown bill.
Belt is a plain black belt with what appears to be a Leatherman worn on the right side.
The patches are the yellow logo with white edging, and are relatively easy to find. One patch on the front of the cap, the other on the left sleeve of the shirt.
Watch (optional for the vet costume) is a square faced silver watch.