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: Silk Charmeuse Pillow Protector Ivory - Standard
Product description: Practical and functional, the Silk Pillow Protector keeps your pillow cleaner, helps prevent pillow dust, makes changing a pillowcase easier and is washable for easy-care. Made of pure silk in a charmeuse weave this can also be used alone as a pillowcase. Quality details include a wide opening with an invisible zipper enclosure.
Product feature: 100% Silk with invisible zipper, Extend the life of your pillow, Protect pillow from dust and germs., Can be used as pillowcase, Non-bleached ivory color only
Product price: $25.00
Product brand: Empress Silk
Target attributes: Size
Answer: attribute: size
value: standard
source: product title