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: Adventure Time Twins T-Shirt Size : X-Large
Product description: It's Adventure Time with Fionna & Cake and Finn & Jake!!
Product feature: 100% cotton, Wash cold; dry low, Imported, Listed in men's sizes, Product Dimensions: 9 x 6 x 0.5 inches, Shipping Weight: 7.2 ounces, ASIN: B00B1O59ZA, Date first listed on Amazon: January 4, 2013, Average Customer Review: 3.0 out of 5 stars 1 customer review
Target attributes: Fastening Style
Answer: attribute: fastening style
value: None
source: None