Question Weighting from Blender not working

Hello all,

I have a quick question about weighting in Unity.
I skinned my low poly character correctly in Blender, but in Unity the weighting appears completely different. What you see is a piece of fabric on one thigh that clips through the leg underneath in Unity

Did I miss something?

Weighting in Blender


Weighting in Unity


Export setting in Blender


Import Settings in Unity


Thanks in advance,
Marcel Pabst