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May 21 (Reuters) - Ralph Lauren RL.N beat Wall Street estimates for fourth-quarter revenue on Thursday, helped by resilient demand for its high-priced Polo shirts and cotton cable-knit jumpers among affluent shoppers, sending its shares up about 9% before the bell.

The company expects constant currency revenues to increase by about mid-single digits to last year, centered around 4% to 5%.

It posted quarterly revenue of $1.98 billion, compared with analysts' estimate of $1.85 billion.