Just because it became dated doesn't mean there's a new item of the same name, but there's not very many holes in gearing (though you may hang on to a piece of gear for more than the usual 10 levels occasionally). The first armorsmith body is the Iron Scale Mail at 22, but you can use the hempen-acton-(grey) and cotton-tabard-(green) until then. Alternately, keep using dated gear; if you're not melding materia into them the new gear offers no particular benefit.