so, i live in the midwest, where it gets to 30 and below in the winter time...i plan on riding my bike to and from work but confused as to how to dress for this...i know i will have to roll up my pant leg as to not get it caught in the chain, so, how do i keep myself warm enough so my legs will not get cold? basically, give me some ideas on winter clothing, or what you do for winter time...thanks