I am wearing the same underwear and bras that I was 30 lbs ago.
For the bras I was on the last set of hooks and straps fully extended. Now I am 3 sets of hooks tighter and have cinched the straps up several inches and they still fit so good for now.
My underwear though… are bikini style and fit very low on my hips before keto. Now they almost come up to my waist! Time for another 6-pack of Fruit-of-the-Looms from Wally World today.