I have the T shirt problem myself. My solution is quite simple. I have bought 500 of the shirt I like the most. My style is grayscale, so I bought greys and blacks. I’ve been wearing the same shirt style for over a decade and have only utilized about 30-40 shirts.
I do this with deodorant, soap, and shaving supplies too.
I do this with deodorant, soap, and shaving supplies too.