I think the answer to your question depends where you are located combined with what are the traditional building methods of the area and available skill. In my part of the world, the San Francisco Bay Area, seeing brick buildings is unusual as it can be costly to make them seismically safe. If one happens to have a real brick wall or walls, it can be nice to expose and clean it to make it a feature as it is seen infrequently. Some of the brick construction here is done as a veneer over wood framing. If detailed property it can be convincing, if not, it can just look like it is a thin veneer just pasted on another wall. Seismic concerns aside, brick construction can be seen as durable and long lasting. The thickness and weight of brick adds to that perception.

For many years, most people use cedar to plank the walls of wardrobes and closets, to prevent moths from eating the cloth. It is said that the high concentrations of cedar oils can kill moth larvae. Plus adds a nice aroma to the closet.In terms of bricks or marble, both are porous and will hold humidity. This after time can cause musty smell in your clothing which is an indication of mold and mildew present in the brick or stone. This however, depends on where you live. Hot climates like Arizona it should not be a problem. You could apply a good 15 to 20 years penetrating sealer which would help to prevent that moisture build up.

Hello - do you mean paint for the walls? I have seen many bathrooms in other countries, not just India, that have a combination of paint/tiles so don't understand why this would be an exception

Brick tiles vary a lot in costing. You may need to visit the store with wall sqft area to be covered. Select the material and then arrive at a cost including labour. You may also have to add the scaffolding costs. Try to keep 5-10 percent towards breakage and wastage.