I collect winter underwear, in moderation. One pair for each day of the week, not each day of winter. I used to have a lot of shoes. But my feet grew a size when I was pregnant with the boys. After that, the shoes were not suitable for taking care of kids. But when my daughter came along, I enjoyed buying her really pretty shoes of all different colors. My sons were disgusted because they couldn't fathom why girls had so many shoes. I especially loved the European ones, which I purchased brand new on eBay for reasonable prices. She loved Doc Martins, so I got her a pair of yellow boots with fish drawn all over them. I was living my love of shoes again, through my daughter's "needs". Her teachers said she was the best dressed girl in school. She was, but only because I also like European clothes that are colorful and beautifully designed. Luckily, my daughter liked all of this attention to her wardrobe.
I collect books, but they are stored by my Calibre ebook management program, so they don't take up physical space. I had about 2,000 and my husband had 5,000 books. All those bookcases took up a lot of space in our home. Now I only have about 100 books, and they are at my husband's house. He probably has about 1,500 books. I converted him partway to using a Kindle.
I shop for gifts the way you do. It's fun!