I don't have the book but have read several excerpts plus skimmed several 1000 post threads over on mumsnet of folks putting it into practice.
I've folded my tops and "filed" them in drawers for a couple years now after I saw a photo of it online. I don't remember any mention of her in connection with that. I don't fold the way she does. I did try it and I'm too impatient.
I tried it with panties and couldn't stand it because I have numerous styles but similar colors and once folded that way I could not tell which was which in large part. I can tell with the tops because most of them are prints and I don't have too many multiples of solid colors.
I tried it with chunkier sweaters that I don't have in a drawer but on shelves in
a tall cabinet. I couldn't stand to see them rolled that way since a large part of whether I want to wear something is my feeling about it's degree of drapiness or not and the exact behavior of its texture and thickness. I found that it worked for me to fold and roll them in such a way as to be able to place them to show exactly what she doesn't like - all the foldedness. My way, I can gauge the thickness and her way I can't.
I *think* she folds bras so one cup is inside the other. I use a small drawer and nest them inside each other but otherwise leave them unfolded.
I've tried hanging my wardrobe every which way and I haven't yet tried her method of hanging all the same color together and going from dark to light.
My closet arrangement is doubled, anyway and the only hanging space for full or longer length garments like dresses or pants is on a small rolling rack I have in there or on the over the door hangers.
I agree with her viewpoint that you have already gotten your value from the garment but I refuse to attribute feelings to my clothing and, honestly, I don't get the "joy" bit. I really relate to the particular aesthetics of each piece or outfit I've made from them but I would say it's more like satisfaction and perhaps enjoyMENT. I don't tend to decide to keep items from just trying them on or putting them in outfits successfully. That's because there can be a lot of artistic satisfaction in creating outfits and what I'm after is the everyday wearability and not the celebration of creativity.
I've purged a lot of clothing over the years. Occasionally I will miss something and regret it but I find that after some time goes by, I no longer do but I may will miss an entirely different item! So I don't give that feeling a lot of room.
I tend to think of it as like judging a dog show. A particular dog is considered best on *that* day. In other words, it was probably the right decision on that day to purge the item. If you second guessed everything you did in life, you'd go mad with paralysis. Remember the shark - it lives only by swimming forward.