As what is affectionately called an 'Alt-O-Holic' (in other words, I play a good many characters of different races/classes), I'll give my 2 cents.
Always bring a set of black clothes for NPC purposes. Dark gray/brown/neutral work too.
Make sure that the shoes you use are GOOD. Aim for period if you can, but aim for comfort above all else. Many hiking boots mens/womens come in brown and black. Break them in before hand: There's nothing worse than blisters!
All the socks.
Remember that your character will evolve over time. All my characters have changed costuming slightly (or majorly) since I first created them. If you use a very generic white shirt, it might become a stitched gray or silver shirt later, or change to red! Some older players have awesome evolution photos.
Think what your physician might need/use. I've seen some players carry bandages or a medical bag (period if possible, or a wooden box). Plastic bottles filled with sand/liquid to imitate medications, etc. For example, my Romani Healer always carries a pack of tarot cards, my Dryad Druid/Bard carries a drum, and my Londwyn Alchemist has a tome or two.
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Amilia Tolunda - Romani - Healer
Aimee "Whisper" Whisperleaf - Dryad - Druid - Bard
Maive Lusterwryn - Londwyn - Alchemist
OOG: Julie Anne B
