I've bought a couple of suits from Rajawongse and about 70 shirts or so. For the shirts, I usually give them a shirt to copy and then pick out the fabric I want. The shirts they make are not prewashed, so over time I have noticed that they shrink a bit, so sometimes I have them make the sleeves 1/2 inch longer, etc. My advice on shirts is get a couple before you decide to get a lot done...there is a learning curve on what colors you pick and types of fabric.

For the suit, definitely know what style you want...try to have in mind an idea of what colors, pinstripes, etc. you are interested in before you go. Other than what you said, think about things like how do you like the trousers, pleated, skinny legs, etc. and for the jacket, think about the length of the jacket, I think the suits i got from their were a little long, don't know if that is their default. Also, it's a great idea to get 2 pairs of trousers per suit, I can't remember if that is standard or not.

It's a nice tailor and Jesse and Victor are friendly. They will just tell you the price, they have so much business they don't really bargain, not that you aren't allowed to try! Good luck!