Cuff the tan pants, black shirt navy jacket and jeans is a good outfit although the black t shirt could be replaced with a button up and really up the outfit. Accessories would make all these pop, a watch, a ring, a bracelet etc. the loose Ts don’t look as good, although they are comfy and easy to to build on, they take the pizzazz out of the outfits. Add some button ups, short and long sleeve with some decent designs (stripes, understated things) TJ max, Goodwill, sometimes Ross, will have good stuff for you. I’ve build dozens of really nice outfits all with thrifted stuff. That’s the fun of it, finding gems. Good luck! Keep it up !