Why Can I See Through My Character?

Hey guys, I'm testing animations for my character in Unity and whenever he rolls, I can see through him in the bottom of the pants area as though there were no shirt to block the light from shining through. I'm using the animation inspector window.

I'm a newbie with Unity so I don't know if this is normal since maybe there's no sun in my scene yet? I'm using Blender to create this character and in Blenders rendered mode, this area appears black because of the natural shadows that appear due to the light being high up pointing down.

Is this really a problem, or will this area appear black/shadowey once I put a sun in my scene to create the correct lighting? Thanks in advance.