Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: American Apparel Men Baby Rib Boxer Brief Size M Purple / White
Product feature: Package Dimensions: 7.4 x 6 x 1.3 inches, Shipping Weight: 3.2 ounces, ASIN: B003UF0XYU, Item model number: 4443_33129, Date first listed on Amazon: September 7, 2012, Average Customer Review: Be the first to review this item
Target attributes: Silhouette
Answer: attribute: silhouette
value: boxer brief
source: product title