I usually don't get geared up in bike clothes unless my commute is at least 15 miles each way (nah, maybe 10 miles or more). How long is yours?

I have a nice 4 mile commute these days, so here's my outfit:

I just wear a shell (currently a Marmot Precip) and a T-shirt when it's about 40-50. Add layers underneath as temps drop. I'm the reverse of no motor - $70 for the shell. $3 for T-shirt. $5 for long sleeve T-shirt.
Thermal Gardening gloves on the hands.
Tear the sleeves off old T-shirts for headbands to keep the ears toasty.
I have some Nashbar tights that were 30 bones. I usually just wear work pants 'til it gets really cold, at which time I'll put the tights on underneath the pants.