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: Billabong Juniors Time Flies Tee Dress
Product description: Solid tee shirt dress, above the knee. Sleeveless muscle tank with a loose fitting and lightweight silhouette
Product feature: 75% Cotton, 25% Modal, Imported, Machine Wash, Solid color, Sleeveless, Package Dimensions: 9.2 x 4.6 x 1.5 inches, Shipping Weight: 3.2 ounces, ASIN: B016WX6EDU, Item model number: J425FTIM, Date first listed on Amazon: April 1, 2016, Average Customer Review: 4.4 out of 5 stars 6 customer reviews
Target attributes: Length
Answer: attribute: length
value: above the knee
source: product description