I also work in a very small office - it was converted from the garage at my boss's home. Most of the time I'm on my own and there are two other part timers who come in on certain days. There is an opening window, but the office gets very hot because of all the pc's and other hardware. Clients do sometimes come into the office but they are very casual anyway as most of them are gardeners, builders etc.

I wear my oldest clothes to work - jeans and t-shirts, jumpers in the winter. My boss lets her kids muck about on the office pc's in the evening (but that'a another story) and I've lost count of the number of times I've sat on something wet or leant on something sticky. I've seen the kids with their shoes on, feet up on the office chairs and so I don't want to be wearing decent or expensive clothes in there.

I really miss not dressing smartly for work, in fact I always change straight away when I get home and then I'm usually smarter than when I was at work!