Wearing size small in these new viral pants. Not sure on the 10 lbs thinner claim but they are a fabulous update on the joggers we were all wearing a few years ago. I am 5’11” wearing size small. I tried the white and they were sheers so go with a darker color. Small tops (size 2 in the non iron button down). Shoes/sandals true to size. LTKootd LTKOver40 LTKTall