UV unwrapping turns the uvmap model inside out When I unwrap this the legs point outwards:
https://i.imgur.com/lu8tjNm.png

I added some white and red colors to the pic to indicate where the verts ended up.

Here is a blend example:
https://www114.zippyshare.com/v/NxgNqXtR/file.html

How to get it to unwrap correctly?
You have the option Fill Holes turned on in the Unwrap settings which gives the undesired result in this case.

Turning it off will unwrap your model correctly.