The perfect in-between garment has to provide enough cover for a comfortable warm-up, but not so much bulk that it gets in your way.
The Infinity Shrug from Pearl Izumi hits the mark. It pairs perfectly with a workout tank, offers just enough extra cover to warm you up, and it’s small enough to tie neatly around your waist once the sweating begins. Sleeves fold down into hand mitts for added coziness. $45 from www.pearlizumi.com.