Foreigners opening a bank account in Thailand depends depends on the individual bank branch.
Some require a lot of supporting paperwork, others are more flexible.
Dress professionally and things will be smoother.
I've tried a number of tailors around BKK but currently go to Rajawongse next to the Landmark Hotel.
Decent quality and prices.
As with all tailors absolutely make sure that you know what you want and communicate this precisely.