Yea it is a dying tradition.
At Pan Am Intl. Flight Academy @ BVI, they dont cut tails. I approached an instructor friend of mine and asked why he didnt rip the shirt off the back of the student? He told me he's never heard of such a thing.
The least to say I was astonished and deeply hurt. The flight school does "not condone such activity". thats a bunch of BS
Its tradition, whether you like it or not. But again, this is coming from a Part 141 school....need I say more.
Congrats again on your solo mate! Hang that shirt w/ pride!