I have had clothes made in Indonesia, Vietnam and Thailand. They are great copiers. The best results I have seen are when you take a piece of clothing with you and ask them to copy it exactly, they will. Otherwise take detailed photos of what you want and sit down with them and explain it all in detail, then check that they understand. If what they produce is not right, most will alter it so that you are happy. Any tailor you go into in these countries will say they can do the job. Many will have comment books that they like to keep. Check it all out carefully, then take the plunge that you feel comfortable with. I have also found that when they take your measurements, they put it on a file and you can order in the future via email.

Good Luck with your venture