Ground Effect Tip Top jersey
The Tip Top, from Kiwi kit company Ground Effect is great either as a base layer or a long sleeve jersey for cooler days.
I'll admit to being quite a fan of Ground Effect kit. It's well thought out, no-nonsense riding clothing that works well on the bike and blends in nicely when you're off it. It's certainly a little more restrained (and cheaper) than the YMX Winter Flower top that Leonie reviewed a while ago!