Nice Dress Clothes For Men

Where I can buy clothing for men bodybuilder?
I want to buy my son a nice dress shirt and pants for her birthday perhaps. He is a bodybuilder and simply buy it, the 2x or 3x does not work because it is a fat man. He needs shirts that are too big in the neck, chest and arms, but tapered at the waist. His age is 30 years. Can anyone suggest a good line department store or regular store?
You'll have to have clothes to measure. Nobody is going to make clothes that fit muscular people. They are gonna be too big or too small. I have to have the pants from the waist measurement is about 31 and legs require my waist pants 36.
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