Before doing so, check with your local drycleaner. The procedure may be both expensive and unnecessary. Some drycleaners offer processing that does not involve tumbling the garment. This would be a consideration for historic garments. Always work with a reputable drycleaner to discuss the possible options.
Some newer garments can be hand or machine washed satisfactorily at home.
Christening gowns or country style wedding gowns in cotton, linen or synthetic blend fabrics can often be laundered. Check the care label on garments and ask the salesperson at time of purchase. If garments are hand sewn, fabrics should be pre-washed before cutting out the garment pieces. Some pre-treatment may be necessary for specific types of stains. Be certain to rinse fabrics thoroughly and do not starch if the item will be stored.