Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Robert Graham Men's Escalade Sport Shirt
Product description: Contemporary checkered long sleeve sport shirt with fine over embroidered design. Sharp multi-color design inside of neckband that continues inside of cuffs
Product feature: 100% Cotton, Imported, Dry Clean Only, Rich embroidered design adds luxuriant texture, Double button cuff, Package Dimensions: 17 x 7.8 x 4.6 inches, Shipping Weight: 12.8 ounces, ASIN: B0081K48FY, Item model number: RF121020, Date first listed on Amazon: June 27, 2012, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 5.0 out of 5 stars 2 customer reviews
Target attributes: Sleeve Style
Answer: attribute: sleeve style
value: long sleeve
source: product description