If you want people to take you seriously you have to look decent and dress decent. If you dress with some old stained t-shirt that shows your nipples and some beaten up sneakers then nobody will respect you unless you're 6'3+ with a very strong jaw.
T-Shirts:
Versatile colours that you should own are white, black, navy, olive and grey.
Make sure your t-shirts are thick enough that they aren't see through and show your nipples unless you're wearing them under a shirt or sweater.
Don't wear 100% polyester t-shirts because they're not that breathable and most of the time look cheap.
Don't wear v necks unless you're wearing them under shirts, sweaters, etc.
Don't wear muscle fit t-shirts even if you're really /fit/.
Don't wear any graphic t-shirts with some superhero on it for example.
Wash them after every wear.
Shirts:
Get a dress shirt without an obnoxious pattern in white, navy, olive or grey.
You will wear a dress shirt for job interviews, going an evening out in town, and other formal events.
Make sure your shirts aren't too see through and that they don't shine too much.
Wear a v neck t-shirt or tank top under your shirt.
Make sure to tuck your dress shirt in your pants and get one of those shirt suspenders so they stay tucked in (look at pic related).
Always wear a leather belt that fits with your shoe colour when wearing a dress shirt.
Don't button up the top button unless you're wearing a tie.
You don't have to wash them after every wear unless they have become dirty.
Sweaters, and hoodies:
It's okay to wear some more flashy sweaters and hoodies with some small logos.
Get some woolen sweaters (make sure to look at the composition of the sweaters because some companies call sweaters woolen sweaters when they only contain 5-10% wool).
Tuck your tank top or t-shirt in your pants when wearing a sweater.
Don't wear very over sized hoodies and sweaters unless you're at home.
Don't wear hoodies if you're older than 30 years.
Don't wear zip up hoodies if you're over 23.
Don't tuck them in your pants like a retard.
You don't have to wash them after every wear unless they have become dirty.
Pants:
Get some chinos in black, navy, olive or grey.
Wear black pants with black, white, olive, light blue, grey and red tops.
Wear grey pants with black, white, olive, navy, light blue, grey and red tops.
Wear navy pants with white, olive, light blue, grey and red tops.
Wear olive pants with white, light blue, black, and grey tops.
Make sure to buy pants that fit you well or bring them to a tailor.
Don't cuff your pants in formal occasions.
Don't wear anything skinny fit or too baggy.
You don't have to wash them after every wear unless they have become dirty.
Jeans:
Have some dark blue, light blue, grey and black jeans.
Wear dark blue jeans with white, grey, olive and navy tops.
Wear light blue with white, grey, olive and khaki tops.
Wear grey jeans with white, darker or lighter grey, olive, navy and black tops.
Wear black jeans with white, black, olive, (navy depends), and grey tops.
Don't wear any old jeans with tons of holes and stains on them unless you're at home.
Don't buy any jeans with holes and fake paint on them.
You do not wear jeans with formal shirts.
Don't wear anything skinny fit, baggy or bootcuts.
You don't have to wash them after every wear unless they have become dirty.
