Hey there! Today I’ll teach you how to fix the transparent rendering accessories.
First Step [1/4]
Select your accessory in the main Blender workspace.
Second Step [2/4]
On the top of the screen, slide down the Node Editor and delete the BOTTOM orange node.
Third Step [3/4]
You may see this if you combined all the accessories into one OBJ file.
Where it says “Slot 4” or whatever your’s says, repeat the above step for every “Slot” in the dropdown by deleting the bottom orange node for every “Slot”.
Fourth Step [4/4] 
You’re good to go! Press the render preview and watch your now-visible accessories make your render look outstanding!
Hope this helps all the people confused on this!
R0bl0x10501050