I couple years ago I lost 50 pounds (then gained back around 10) so yes I can fit into clothes from 10 (and 20) years ago.

Truth is, since around 1990 my weight has tended to fluctuate somewhat so I have two pairs of black pants and two pairs of khaki pants which have served me over the last 20 years (I don't wear long pants much!)

LIkewise I've been able to wear the same shirts during that period, though I've had a couple of heavier spells when I've had to go up a shirt size.

I've been able to wear the same kilts all that time, by adjusting the buckles every now and then. But at my slimmest periods there's quite a bit of fabric going across underneath! For some reason my latest two kilts have been made a couple inches larger than I specified, and neither has ever been worn at the original buckle positions. In other words, when the kilts came I had to move the buckles a couple inches tighter. (Dangerous, because I have plenty of "expansion" room!)