Mesh Not Appearing Right In Game

Hi. We would need to see blend and package files to know for sure.

The normal map must not have transparent background. Its size also matters and differs by category. Before i elaborate, please tell me, did you intentionally move uvs and textures in the area for accessories? If yes, it makes things a bit complicated, since not all of them can have normal maps at all. Also, a diffuse map must not go into specular, it will be too shiny
Just in case, cas items share the same uv space space split into designated areas by category. So, your uvs must be in the space meant for shoes. If for whatever reason you want them out of that place, it is best to put them in the space meant for hats only ( because hats can have normal maps and their size is limited to the hat region)