One piece of clothing and an improvised melee weapon after taking a shower, eh?
For clothing, it'd probably be slacks. For improvised melee weapon on the fly, it'd have to be the toilet seat lid. Because it just happens to be lying next to the toilet after a roommate broke it off ((No, I have no idea how it was broken off. Frankly, I don't want to know.)). So their breakage and the lack of them repairing it at least saves my life against the first zombie!
Although whether that'd get me much further as time progresses is up for debate, I'd at least hope to have more time to prepare/get clothed after dealing with the first zombie. Hopefully. I'd at least want to become zombie bait properly clothed.