[gmku]

Depends. On time of day, tasks to do. During a normal day, I usually have to run at least one or two work-related as well as personal errands that require a modicum of decency, so usually I'm in very casual attire--T-shirts, cargo pants or jeans, or shorts if it's hot and muggy. If I have to visit a potential client, I take it up a notch to business casual (very casual, as in beltless khakis and an untucked polo shirt or something like that).

It helps to follow a regular daytime routine of showering and dressing and so on to hold the slacking potential at bay. I associate pajama wear during the day with sickness, depression, and goofing off, so that's not an option. Unless I'm sick, depressed, or goofing off.