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: Nine West Women's Comfty Navy Synthetic Loafer 8.5 M
Product feature: Package Dimensions: 12 x 5.4 x 4.2 inches, Shipping Weight: 1.05 pounds, ASIN: B00IRXJRGK, Item model number: 25004111-410, Date first listed on Amazon: July 23, 2014, Average Customer Review: 3.0 out of 5 stars 1 customer review
Target attributes: Silhouette
Answer: attribute: silhouette
value: loafer
source: product title