Sounds to me like you've just got your clothing really dialed to the temperatures you ride in :-) I hate getting overheated, so I'm really anal about wearing *just* enough to stay comfortably "slightly warm" and dry(ish). If I do this right I don't have to change my tops very often, even when I'm not wearing wool.
When it's cold out this is pretty easy, once the weather turns damp it's harder. In cold dry weather I can wear the same stuff for 3-4-5 days, after one day (2 commutes of 15-20 km each) in wet weather my clothes can stink to high heaven. Seems like the smell sets in a lot faster if I don't manage to partially dry out what I'm wearing as I go. Some microbiologist could probably tell me more than I really want to know about this process
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett