I got this last night and I'm in love.  It's perfect for the not cold enough weather to wear a jacket and not warm enough weather to just be.  It's SO WARM!  I've never owned anything made by Columbia before and I have to say the construction and durability is top notch, definitely worth the money.  I anticipate this lasting forever!

I bought a small (wear a size 6) and can say that this will fit with a light shirt/sweater underneath.  If you wish to wear anything thicker you will want a medium.