I picked up a pair of the new skinny fit overalls in the Adriatic wash at Madewell when I was in Boston two weeks ago, and I've been wearing them nonstop. I sized down to XS, but possibly could have gone smaller because the denim is very stretchy. From the back they fit like a nice pair of high rise jeans. I cannot recommend these enough!
So far I've been wearing them with Uniqlo heat tech long underwear, a flannel button down shirt,
and a blazer. The extra fabric over my core really helps keep me warm. I would love a pair in black if they ever offer it--preferably without all the distressing.
A word abut fit. I'm 5'4" and 115 lbs with a long torso, and I've lengthened the straps as far as they'll go. Also, size down if you want them close fitting. I thought the size small made me look wide. It was only due to the persistence of the very helpful shop girl that I was convinced to try on other sizes.