GR translation: reet pleats

[Mike Jing]

P249.4-12   ... It is all out of shape, no focus to it until a sarcastic
flourish from the band, and here comes the meanest customer Slothrop has
seen outside of a Frankenstein movie—wearing a white zoot suit with reet
pleats and a long gold keychain that swings in flashing loops as he crosses
the room with a scowl for everybody, in something of a hurry but taking the
time to scan faces and bodies, head going side to side, methodical, a
little ominous. He stops at last in front of Slothrop, who’s putting
together a Shirley Temple for himself.

What are "reet pleats"?  Specifically, what is the meaning of the word
"reet" here?  I am having trouble finding an appropriate translation.
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