My model is meant to be a UGC, problem being that when i use “Asset Creator” plugin to make it into accessory, it no longer supports doublesided option. Can i somehow fix this without remaking the model?
You are most likely going to have to go back to your software and edit your model, since a lot of the studio sided features are unavailable for asset creation. However, it sounds like it should be as simple as just some extrusions/intrusions to solve your issue.
If you use blender then you can Alt + N to flip the normals. Also in the viewport shading you can enable backface culling to better identify what will be visible and what won’t be.