This and That

Lining

The interior of Egyptian and Turkish belts and bras is mostly covered with lining, and most of the bras are stuffed with cotton.
I don’t do this with my own costumes, which saves a lot of work and facilitates repairing. You should use non-slippy material, as cotton.
Take care that the form of the bra does'nt change. The same applies to lining the wider belt shapes: make sure that the shape is not changed by the lining cloth.

Cleansing of Costumes

The outside of belts and tops covered with sequins is rather practical, but after some time the inside of tops especially shows some traces of use (sweat).
Some dancers wash their costumes in a pillow case in the machine; I haven’t tried that myself.
But I have simply washed one of my elastic velvet tops (Bella) in the sink, like a selfmade sweater. It did not do any harm, the top looks brandnew.
You can also dab the costume with a sponge containing some mild soap or hair shampoo solution. Try before whether the costume can stand that and does not loose shape or color.

Be careful with cotton-lined belts or tops, they may shrink in contact with water!
The thick wires sometimes used for enforcing the edges of tops or belts (in Turkish costumes mostly) can start to rust, causing ugly spots.
Veils and skirts made from polyester georgette or royal chiffon can simply be rinsed in the bath tub or in the fine laundry program of the machine.
In most cases, even fat spots (make-up, lip stick/wax) is removed, otherwise pre-cleansing spray may help. For valuable cloth, there may be the risk that the skirt shrinks, "bleeds out" or becomes uneven, depending on the material.
Better take it to the laundry, that is also safer for the sequins.

The sequins are very sensitive to parfume (solvent). Parfume or hairspray is also harmful for jewelry, especially for rhinestones.