Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Kenneth Cole REACTION Men's Boxer Brief Set Central Pack
Product description: Kenneth Cole REACTION 3-pack cotton stretch boxer brief
Product feature: 100% Cotton, Imported, Machine Wash, Colored waistbands, Modern look, Package Dimensions: 10.4 x 5.6 x 2 inches, Shipping Weight: 7.2 ounces, ASIN: B0198WS8UE, Item model number: REM8213, Date first listed on Amazon: April 1, 2016, Average Customer Review: 3.7 out of 5 stars 24 customer reviews
Target attributes: Silhouette
Answer: attribute: silhouette
value: boxer brief
source: product description
attribute: silhouette
value: boxer brief
source: product title