Asweater,pullover,jumperorjerseyisarelativelyheavygarmentintendedtocoverthetorsoandarmsofthehumanbody(thoughinsomecasessweatersaremadefordogsandoccasionallyotheranimals)andtypicallysupposedtogooverashirt,blouse,t-shirtorothertop.Sweaterstendtobe,andinearliertimesalwayswere,madefromwool(typicallyofsheep,thoughpossiblyofalpacaorothertype),however,theycanbemadeofcotton,artificialfabricsorsomecombinationthereof.
Ahockeysweaterwas,intheearlydaysoficehockey,recognisableaswhatwewouldnowcallasweater,buthasevolvedintoasortofjersey.
InBritishEnglish,asweateriscalledapullover,sweater,jerseyorjumper,thislastbeingthemostcommoninAustralianEnglish.Ifmadeofthickcotton,itisusuallyknownasasweatshirt.Arelatedgarment,ajumperwithanopenfrontfastenedbybuttonsorazipper,iscalledacardigan.