I worked with a guy, recently retired, who had one pair or shoes (black Adidas) one pair of sandals (Birkenstock) one pair of nylon shorts, one pair of breakaway pants and three T shirts in his wardrobe. Those were his work clothes post white book, so circa October 2009 and they lasted him until this summer when he retired. It didn't help that he showered about once a week and always showed up on position with a massive 6 liter bowl of fresh popcorn.
I'm all for being comfortable in the facility, because lets face it who are you trying to impress? I worked a tour group last week (I didn't know I would be until I left the sector) with four days beard growth, but I at least had clean clothes and a shower, jeeze.