I tried posting this on the Unity forums but no one there knows what the problem is and they suggested it could be a UV mapping problem within Blender. When exported my character from Blender into Unity via fbx, I've been trying to figure out why his shirt texture is stretching only in certain areas and I cannot figure it out. Here's a link to a video so you can see the problem:
I think I'll try to see if weight painting is causing the problem a little later today. I've already tried all the following things:
Tried in Blender:
Applied location rotation and scale before export. Applied all modifers before export except armature modifer. Tried UV minimize stretch. Tried conformal UV unwrap. Tried changing Auto Texture Space on the shirt and changing it to the same rotation, location, and scale of the object.
Tried in Unity:
Texture Type: Normal Map Wrap Mode: Repeat
If you any ideas, please let me know, thanks in advance.