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: Womens Maxi Dress Ladies Jersey Toga Maxi Racer Back Long Vest Maxi Dress Skirt
Product description: Excellent Quality Maxi Dress Racer Back Vest Style Dress Gather Detail Around The Waist Multiple Colours Approx Length From Shoulder - 139cm 95% Viscose, 5% Elastane Machine Washable Any Queries Please Email Us
Product feature: Excellent Quality Maxi Dress, Racer Back Vest Style Dress, Gather Detail Around The Waist, Sleeveless, Shipping Information: View shipping rates and policies, ASIN: B07C3KBGY5, Date first listed on Amazon: August 13, 2013, Average Customer Review: 3.4 out of 5 stars 61 customer reviews
Product price: $4.70 - $14.47
Product brand: Outofgas
Target attributes: Length
Answer: attribute: length
value: maxi dress
source: product feature
attribute: length
value: maxi dress
source: product title
attribute: length
value: maxi
source: product description
attribute: length
value: maxi
source: product title