Part the hair. Real fur has a dense layer of "underfur" beneath the longer guard hairs.
If you are buying real fur, follow these tips from experts at Pologeorgis and Yves Salomon :
Check the lining. High-quality coats feature perfectly aligned seams and a dense, consistent distribution of fur. 3. Popular Fur Types & Costs
Prized for its unparalleled warmth and longevity. High-quality genuine fur feels exceptionally silky and has a natural sheen that synthetics can't quite replicate.