You’ll be able to get an ao dai made in Hoi An within 24 hours if need be, even sooner if you’re in a rush. But it’s worth taking time if you have it. An ao dai is a close-fitting garment and if you’re going for a bespoke dress and trousers then it’s worth going for as high-quality a service as you can afford – two or three fittings may add to the cost but will ensure you have a garment that looks truly fabulous.