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As 3DGuardian mentioned, the thighs are not printing as a solid piece, only the walls.

I added a remix with the fixed files. The instructions on how I did this are below.

Open in Meshmixer
Go To Edit -> Make Solid
Use These settings:

Solid Type => Accurate
Solid Accuracy => 512
Mesh Density => 512
Offset Distance -> 0.5mm (this is the important setting, which you can try playing with)

Click Update
Click Accept
Export as binary .stl
Import into your slicer and confirm that it's printing as a solid.