Wash cool and inside out. Cotton jersey — the tees, polos, tanks and long-sleeves — is the low-maintenance core of the wardrobe, but heat is still what ages it: it shrinks the knit, fades the dye and cracks any print. A 30°C cycle inside out, sorted by colour, holds the shape and the depth of colour far longer than a hot wash ever will.
Go easy on the dryer. A cool tumble or, better, a line dry keeps tees from shrinking a size and going boardy at the hem. Take them out slightly damp, give them a shake and a smooth with your hands, and most cotton jersey needs no ironing at all — it's only baking them bone dry that sets the creases.
Loopback sweats want the same, minus the softener. The hoodie and joggers are heavier loopback cotton — wash them inside out, skip the fabric softener (it coats the loops and kills the soft hand), and air dry so the cuffs and waistband keep their stretch. Wash them less often than tees; an airing between wears does most of the work.
Socks and pale cotton run their own load. Everyday cotton socks take a warmer wash with like colours and a low tumble, and turning them inside out clears the grit and lint that wears the sole thin. Keep whites away from anything dark, treat marks before they set, and the whole cotton core stays crisp for years.