Mystery?!?

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Came off the bike this morning on a patch of oil. Minimal damage to the bike (scuffed brake hood and its been moved inwards, not bent). The bike was the 1st thing I checked.

Grazes to my hip and elbow which are a bit sore but I also got off lightly. What I don't understand is the clothing damage. Was wearing 3 layers this morning. A lightweight waterproof which is totalled at the elbow, then a long sleeved top which is fine, and then a compression layer which is again totalled at the elbow.

How can the inner and outer layers been torn but the middle layer be fine? Confused!!!
 
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