Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Tommy Bahama Mens Button Down Short Sleeve Silk Camp Shirt
Product feature: 100% Authentic Tommy Bahama merchandise, satisfaction guaranteed!, Very high quality fabric: 100% silk; Machine washable., Fully button down front closure for easy on and off., Embroidered Tommy Bahama logo on the inside of the center back neck., Great shirt you will love and wear for a long time!, Package Dimensions: 10 x 6.1 x 1.4 inches, Shipping Weight: 8.8 ounces, ASIN: B00N0JT4VE, Date first listed on Amazon: August 25, 2014, Average Customer Review: 5.0 out of 5 stars 2 customer reviews
Product brand: Unknown
Target attributes: Neckline
Answer: attribute: neckline
value: button down
source: product feature
attribute: neckline
value: button down
source: product title