Final answer:
Haute couture purchasing involves the Costume Designer making purchases for the show, the costume shop deciding what to make, buy, or rent, and Costume Technicians building the costumes.
Step-by-step explanation:
The process of haute couture purchasing involves several steps. Firstly, the Costume Designer will make purchases for the show, including fabrics, clothing items, shoes, trims, and accessories. Secondly, once designs have been finalized, the Costume Designer presents their renderings to the costume shop. The shop determines which designs will be made in-house, which can be bought, and which items need to be pulled from storage or rented from another theater. Finally, the Costume Technicians begin the build process, creating patterns specific to the actors' bodies and making mockups before constructing the final garment.