Medium and small dog jackets (Hanwell W7)

Hi, my dog is a skinny short haired Spanish hunting dog and needs a jacket in this cold weather, but she goes into the brambles and loses her jacket every time. Does anyone have any dog jackets surplus to requirements they would like to donate to my dog? Her body is the size of a long jack Russell, or a small whippet, so she falls in between medium and small. Many thanks!