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: KOH KOH Women's Sleeveless Sexy Halter-neck Cocktail Maxi Dress
Product description: A beautiful sleeveless halter-neck design maxi dress from Koh Koh. This wonderfully sexy maxi is highly versatile and is the perfect casual maxi dress however you can dress it up with some nice jewelery for a stunning cocktail maxi for evening events.
Product feature: FABRIC TYPE - Matte Jersey (5% Spandex), GARMENT CARE - Hand or machine washable. Can be dry-cleaned if desired, Bust/Chest: (S) 32.5-35 inches (M) 35.5-37.5 inches (L) 38-40 inches (XL) 40.5-43 inches (2X) 43.5-47 inches, Total length is 57"/145cm, Hand wash or dry clean., This item comes with FREE SHIPPING worldwide, Package Dimensions: 8.2 x 5.4 x 4.2 inches, Shipping Weight: 15.2 ounces, ASIN: B00E98806U, Date first listed on Amazon: July 31, 2013, Average Customer Review: 3.4 out of 5 stars 4 customer reviews
Target attributes: Sleeve Style
Answer: attribute: sleeve style
value: sleeveless
source: product title
attribute: sleeve style
value: sleeveless
source: product description