Trudy, Congratulations! Staying within 4kg of goal weight for 18 months is a huge accomplishment! Giving too big clothing away, I believe is a positive move.
I have too adopted the Keto WOE and have been doing it with success for a little over a year. When I started I was wearing a size 16 jeans at around 185-190 pounds (should have been in a size 18 but I didn’t have any 18’s and refused to buy any). All my life I have yo-yo’ed from a size 8 up to a size 18, mostly around a 12 or 14. (I am 5’4" tall). Always, while yo-yo’ing, I have kept my clothing as I lost/gained weight because I guess subconsciously I knew I was going to lose/gain weight again, the vicious cycle. But this time was different! As I lost 10 pounds (a size for me), I would clear out my closet and donate whatever was too big to my local thrift store that benefits a great charity. While I was there donating, I would shop for my new size and bring home some new clothes - repeating that process whenever I lost another 10 pounds. Now I am in a size 4 at 125 pounds and it feels great. I am 53 years old and have never felt better in my life! I have osteoarthritis in my spine, pelvis, feet and ankles and I have no pain ever in those joints anymore. I take NO medications whatsoever and I have more energy than I did ever - in fact, yesterday I went strong all day on only 3 1/2 hours of sleep and a nutritional intake of 75% fat, 20% protein and 5% carbs @ around 1800 calories.
This WOE and way of life, I cannot say enough about. I am a cheerleader for it!
Look at it this way - you have accomplished so much to get and stay where you are - consider the donation of your bigger clothes as a celebration for those accomplishments! Keep up the awesome work!