Updated: Jan 25, 2019
Developing a complete wardrobe is something that should be done over time, I've said it before and I'll say it again. Expanding my own wardrobe beyond my means was one of the worst mistakes I've ever made. In order to help you gentlemen avoid the same mistake I would recommend focusing your effort and money on certain pieces, see "Starting Out? Only Spend Money on These."
Allocating money one way inevitably means that it will not be spent elsewhere, and that is okay. When starting out both your pants and shirts do not need to be of the highest quality. Think of shirts as just layering opportunities, whereas pants, though a foundational pieces, can be skimped on in the name of better outerwear and shoes.
I can wholeheartedly recommend brands like Levi's and Banana Republic for basics. Levi's offers so many types of fit that resemble those on offer from designers with proven fabric. Buying designer, or even Banana Republic jeans, hasn't paid off for me in my journey thus far. Though comfortable, a lot of the new jeans that flaunt blended fabrics will not withstand the type of frequent use they experience as part of an interchangeable wardrobe. Pants aside, I've found Banana Supima cotton shirts resist fade and maintain their shape under heavy stress.
Remember, whatever you do, avoid branding and find the fit that best suits you. Just because you're skimping doesn't mean you should compromise Wardrobe Fabrication directives.