I did my own version of the container concept and numbers, my number was 7 (no idea why, maybe for days of the week) for tops. So all of my clothes (apart from underwear and pjs) are hung up in the wardrobe. For tops, I have 7 basics (under vests, under thermal tops etc.) 7 summer tops (sleeveless / hot weather type tops), 7 shirt tops (mix of going out silk shirts, work shirts, casual) and 7 long sleeve tops (mix of work and at home). I have 7 jackets / coats (smart wool coat for work, cycling jacket, spring jacket, thick padded waterproof long coat with lots of pockets that is perfect for standing in cold fields watching various weird sports / training sessions), smart blazer, cagoule type, and a hiking jacket), 7 skirts or shorts, 7 cardigans, 7 dresses and 7 jumpers. If i am tempted by something new, one of the 7 has to be worn out / donated / vinted.
It sounds bonkers, but i barely buy anything new unless it breaks / wears out, I know I have 7 of each category or sub-category, so if boiling hot I can do a week wearing 7 x summer tops, or I can mix and match from the 7 and still have plenty of choice. All the items are hung up and fit in my 'container', so I can see what I have and mix and match as needed.
I read somewhere about shopping your wardrobe, so having everything hung up gives that dopamine rush of browsing and selecting items as if I were in a shop, and I enjoy dressing now compared to having hundreds and hundreds of items stuffed everywhere, never having anything to wear as I didn't fit or like the items.
Made life a lot easier :) just my twopence!