You want to make sure your dress is perfectly fit for you. Ask sellers where you can try them by using below english conversation.
Example 1
You : Can I try this shirt on?
Seller : Sure sir. The fitting room is over there around the corner
You : Thank you..........
You : Well, I don't think it fits me. I wil try the tailor-made one instead. Sorry.
Seller : Alright. It's up to you. Thank you.
Example 2
You : Excuse me, do you have a fitting room?
Seller : Of course, we do. It's on the right hand side behind that counter
You : Can I bring more than one dress to try at a time?
Seller : Yes sure.
You : Great. Thank you.