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: Check Button Down Sport Shirt by Nantucket Brand Clothing Co.
Product description: This white and peach men's check shirt is made from 100% cotton. Button down shirt has a left chest pocket with embroidered whale and compass logo. This shirt also features a curved bottom hem, custom Nantucket Brand buttons and a button down collar. Very soft. Machine washable.
Product feature: 100% Cotton, Men's button down shirt: features a relaxed fit with a subtle two-tone check pattern, Long sleeves with button cuffs: sleeves can be worn long or unbuttoned and rolled up, Button front closure and button down collar: wear it buttoned up with a tie or unbuttoned over a tee, Left chest patch pocket with embroidered Nantucket Brand whale and compass logo, Made from 100% cotton, Package Dimensions: 14.5 x 10.8 x 2.3 inches, Shipping Weight: 12 ounces, ASIN: B005X4RVPU, Item model number: 20603, Date first listed on Amazon: September 27, 2011, Average Customer Review: 3.9 out of 5 stars 16 customer reviews
Product brand: Nantucket Brand Clothing Co.
Target attributes: Fastening Style
Answer: attribute: fastening style
value: button down
source: product feature
attribute: fastening style
value: button down collar
source: product description
attribute: fastening style
value: button down
source: product description
attribute: fastening style
value: button down
source: product title