There is a zipper where an inner liner can be zipped in.  If you find one that fits, you could certainly attach it and have a super warm, versatile 3 in 1 coat!

2 outer pockets and 1 inner pocket

Radial Sleeves

There are some scuffs/light colored marks on the coat and the word "Bugaboo" has some fading. Please see photos for item condition.