I'm fairly new to mesh making and I just recently figured out how to rig a mesh,
so I made a shirt, it's properly deformed in blender, all bones are linked to the right area in weight paint mode (1(2).png)
but when I try to upload it, it is rotated to Y-axis (22.png)
and when I include skin weight, it is completely ruined (3.png)
And it is actually how it looks like if I upload it and wear it.
I've searched everywhere but can't really find a solution to this, I'd really appreciate it if you guys can give me some useful tips!