Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: U.S. Polo Assn. Men's Plaid Oxford Cloth Straight Point Collar Sport Shirt
Product description: Long sleeve two patch pocket plaid oxford cloth classic fit sport shirt
Product feature: 55% Cotton, 45% Polyester, Imported, Button closure, Machine Wash, Straight point collar, Two button close patch pockets, left pocket has logo label, Shirt tail hem, Classic fit, Product Dimensions: 14.6 x 11.4 x 1.6 inches, Shipping Weight: 12 ounces, ASIN: B01GIYFSAI, Item model number: 11-9581-S0-MDIN-L, Date first listed on Amazon: July 26, 2016, Average Customer Review: 3.9 out of 5 stars 5 customer reviews
Product brand: U.S. Polo Assn.
Target attributes: Pattern
Answer: attribute: pattern
value: plaid
source: product description
attribute: pattern
value: plaid
source: product title