Expect a contract. The dressmaker, detailing exactly what you have asked for, will draw this up. It may include pictures drawn by the dressmaker to suit your ideas. It will state the number and type of garments ordered, the fabrics to be used, and the timescale.

Read the contract all the way through before signing and returning the dressmaker's copy. Make sure you understand all the terms and conditions of the contract. It is a legally binding document, and once signed, you have agreed to its terms. If there is anything in it you don't understand, ask.