I generally go to Kohls because they have stuff that actually fits me (6'5 and I wear 34x36 pants) and the quality for the price is a great value. For cargo pants I go to Ranger Surplus because real BDUs are light years beyond the horrid shit that "designers" make. As far as actual brands:
Arrow for dress shirts because they have a great range of sizes and fits.
Axist for dress pants because they actually make long pants.
Merrell for shoes.
EMS brand for miscellaneous apparel such as fleeces, shirts, pants, etc...
Adidas for sports clothing.
XI Wiki



