Being really small is quite a problem from the clothes sizing perspective. My waist is about 28" - this means that jeans with a 30 waist will fall right off without a belt. Finding anything smaller is pretty hit-and-miss.
So true. I mainly buy clothes in kids sizes, and a lot of stuff is available at the thrift store. Many young teenage guys of my size outgrow things before they wear them out, or it isn't the fashion they want so it gets ditched brand new.