Expanding on my previous post, we're about the same size it sounds like. Find a brand that fits you well, as in you've tried their stuff on in person and know how it fits you. Clothing varies even the same size of the same brand but at least you'll have a general idea, for me it's Hugo Boss 2XL shirts and 34x32 pants. Then go on ebay type in "hugo boss 2xl" for example and buy a few casual shirts, a few button downs, a couple pairs of jeans and a couple pairs of nice pants, also shorts if you're so inclined and you're all set. It won't cost half as much as it would in the store you'll probably invest $500 total for a new bangin ass wardrobe if not less. If you find something you really really like get it tailored and only dry clean it so it lasts forever and fits perfect, trust me you and others will be able to tell the difference. For more casual/athletic stuff but still nice lululemon in size XL is what fits me, you can get them for half price if not less on ebay as well.
I like to dress sharp but I don't like to pay for it fuck that, one thing about buying name brand stuff vs random H&M or express garbage is that it will last you for years while the other stuff will be crap as soon as you wash it or wear it a couple times. Big difference in how a Hugo Boss pair of pants and shirt fit and look vs some random crap at H&M, it's night and day.