depends how often you want to do laundry. I do laundry once a week.
I keep in my wardrobe
~10 jersey cotton shirts
~5 sweaters
~one jacket, a zip hoodie, and a pullover hoodie
~15 pairs of boxers
~as many wool socks as I can afford
~3 pairs of casual paints, then a couple other pairs for outdoorsy or formal settings
~one pair of casual boots, one pair of canvas sneakers, some dress shoes, and athletic shoes
~job shit, whatever you need for work
I used to keep some collared shirts around but I've realized that they will never be as comfortable as cut and sewn cloth. These days I'm not needed to be formally dressed so I stay comfy 24/7. Being comfortable always looks good.