In past we would use wooden panel door shutters in bathroom and W C but with the passage of time, the quality of wood has not been good and inferior wood is being used in the door shutters.
The life of wooden shutters or water proof plywood shutter is short and these shutters are decayed after some time. PVC door shutters are extensively used in bathroom and W C.
But as per your question you want to fix new type of door shutters for bathroom and WC. The following types of door shutters may be used in bathroom and W C.

1. Aluminum door shutter.
2. Aluminum frame with frosted toughened glass panel door shutter.
3. Frosted toughened glass door shutter.
4. F R P i e Fiber Glass Reinforced Plastic door shutter.
5. L V L i.e. Laminated Veneer Lumber (Rubber wood products) 1.5 to 2.5 mm thick veneer with grain in one direction door shutters.
6. E P S i.e. Expended Polystyrene Door shutter.

But generally aluminum and frosted toughened glass door shutters are used as they are good looking, easily available and do not need paint coating. They are costlier than plastic doors about five to seven times according to the location and availability in local market.