想訂酒店用作出門用

Normally hotel won't let you do so cause there will be a lot of noise and other guests will complaint. But if you booked the wedding dinner at their hotel they can allow you to do so.

But you can try to find travel agent to book a suit for you (一定要套房才夠大). Not sure about the current rate, I guess around $2,000 something lar (it depends on the seasonality)

Good luck to your wedding.