Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Aldo Men's Osegod Slip-On Loafer
Product description: Men's loafer
Product feature: 100% Cow Leather, Imported, Leather sole, Mocc-toe loafer featuring penny keeper and driver's heel, Package Dimensions: 13.2 x 7.4 x 4.8 inches, Shipping Weight: 1.65 pounds, ASIN: B01AIL7468, Item model number: OSEGOD, Date first listed on Amazon: June 28, 2016, Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.0 out of 5 stars 4 customer reviews
Product brand: ALDO
Target attributes: Silhouette
Answer: attribute: silhouette
value: loafer
source: product title
attribute: silhouette
value: loafer
source: product description
attribute: silhouette
value: loafer
source: product feature