Trust that your dressmaker is a dedicated professional and will work with you to create the gown of your dreams. Get a referral, and ask to see samples. A completed project will give you a good idea of work quality, and a good selection of pictures will let you see the range of work the dressmaker does. Be wary of dressmaker with no prior work to show, and only a few fuzzy photographs of completed projects. Don't worry if you don't get to see in the workroom and fittings are done elsewhere: workrooms may not be suitable for fittings. Some do most fittings in their workroom, but those with larger premises prefer to keep sewing rooms and fitting area separate.