I do something similar. I pay close attention during a season when I say “i could really use .... “. If I think it more than twice , I will write it down. This season it is light grey tees. In linen and whisper weight cotton.
I do the same for my sister , but in more depth. She is intellectually disabled so i handle her wardrobe.
I go through her seasonal wardrobe with her ... I know she runs really warm ... so I knew she needed more linen this year and not so many lightweight cotton sweaters. And so on. It really works well for us.