Expensive designer brand famous for its classic polo shirts. Advertised as "Classic American style". A truly "prep" sort of style, not the Abercrombie or AE type. Though I am not a "prep" by any means (I am not even Caucasian, but Filipino), nor would I ever wish to be one, I own a large number of RL polo shirts and an RL business suit due to its subtle classy look and its good material and construction.
Ralph Lauren is what wannabe preps should be wearing, if they wished to emulate being preps.