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: Lookatool Underpants Knickers Sexy Men's Boxer Briefs Shorts Underwear Pant
Product description: Size Details: Size: M( 66CM-88CM/26.0"-34.6") Size: L( 70CM-90CM/27.6"-35.4") Size: XL( 74CM-94CM/29.1"-37.0") Size: XXL( 76CM-98CM/29.9"-38.6") Package Content: 1X Man Underpants (NO Retail Box. Packed Safely in Bubble Bag)
Product feature: Imported, 100% brand new and high quality., Style:Boxer Brief. Brand New and Never used., Material:Cotton., Size: M( 66CM-88CM/26.0"-34.6")/L( 70CM-90CM/27.6"-35.4")/XL( 74CM-94CM/29.1"-37.0")/XXL( 76CM-98CM/29.9"-38.6"), Perfect for lingerie night, self pleasure., Shipping Weight: 2.72 ounces ( View shipping rates and policies ), ASIN: B01CCBPGJO, Item model number: AK3-AT1-GL-M-X, Date first listed on Amazon: February 29, 2016, Average Customer Review: Be the first to review this item
Product price: $0.47 - $1.46
Product brand: Lookatool
Target attributes: Silhouette
Answer: attribute: silhouette
value: boxer briefs
source: product title
attribute: silhouette
value: boxer brief
source: product feature