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: Alfani Mens Slim Fit Stretch Button-Down Shirt Beige XL
Product description: Alfani Spectrum Slim-Fit Solid Dress Shirt, Antique White, 17-17.5, 36/37
Product feature: 97%Cotton/3%Spandex, Machine Wash Cold, Antique White Color, Neck 17-17.5, Sleeves 36/37, Slim Fit, Imported, Package Dimensions: 10 x 10 x 1 inches, ASIN: B001EVM8KO, Item model number: AU15SLSDAW, Date first listed on Amazon: January 31, 2017, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Alfani
Target attributes: Neckline
Answer: attribute: neckline
value: button-down
source: product title
attribute: neckline
value: dress shirt
source: product description