Spend the extra money for a custom suit, its worth it.
Now, I'm not saying you have to go all the way up to a designer like Tom Ford. One quick look at their website store will give you a sense of what you would need to pay for a suit (A simple Tom Ford shirt is approximately $500), but you should have no problem investing around a thousand bucks on a nice, high quality suit.
For everything else (t-shirts, pants, etc.), I don't think it really matters.
Now, I'm not saying you have to go all the way up to a designer like Tom Ford. One quick look at their website store will give you a sense of what you would need to pay for a suit (A simple Tom Ford shirt is approximately $500), but you should have no problem investing around a thousand bucks on a nice, high quality suit.
For everything else (t-shirts, pants, etc.), I don't think it really matters.