Like computers? Wear clothes? Chargrilled.com may have the answer.
Chargrilled.com sells inexpensive, amusing slogan t-shirts, and has a range of IT- and computer-related threads, perfect for the unreconstructed geek in you. (Well, amusing is a matter of taste. I can't recommend wearing [as I did] a 'Been grooming' t-shirt when the inlaws are expected, but my nephews now think I'm the funniest auntie in town).
Comfy, colourful and better quality than many online t-shirt vendors' wares, Chargrilled.com's shirts are just the thing for those long stints on the PC Advisor forums. And the best thing is, you don't even have to get changed before you roll into bed in the early hours! (Actually, the best thing is the £14.95 price tag - try getting change out of fifteen quid on the high street.)
Release the geek inside, Chargrilled style