I'll try to explain in terms that will make sense to someone from the classic body era. When I came in in 2007 the classic avatar was all there was. Skin and tats were just skin and tats. Clothes were shirts, skirts, underwear, socks, jacket... OR they were a prim attachment. Along came mesh and we got mesh clothes and a bunch of problems we had to work around. A solution to good portion of the problems was Standard Sizes. The idea was we fit our avatar to the mesh clothes we attached.
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