Nothing original here: I also like padded lycra shorts (two pair) and long-sleeved non-cycling-specific tech shirts (two); for socks I take two pair that are very short made by SmartWool..
I keep a very lightweight pair of nylon shorts handy in case I feel like covering up the lycra shorts when I stop.
Additionally, I take some convertible pants, a nice-ish short-sleeved synthetic collared shirt, one or two wool or polypro tops, a brightly colored breathable rain jacket, and some cheap rain paints. For sleeping or (or wearing when I find a laundromat) I take a pair of cotton socks, a pair of boxer shorts, and a cotton t-shirt.