Clothes is related to Size. Size is related to Space. 
Plain is the opposite of Sophisticated. Sophisticated is a synonym of Advanced. Advanced is a synonym of Progressive. Progressive is a different concept from Stream. 
Clothes <--RelatedTo--> Size <--RelatedTo--> Space 
Plain <--Antonym--> Sophisticated <--Synonym--> Advanced <--Synonym--> Progressive <--DistinctFrom--> Stream 