Do the WW2 Kuomintang soldiers still wear collar patches after a certain time?

Feb 2017
The Rainforests
I heard that after the Battle of Shanghai, that KMT (Division 88 specifically) soldiers stopped wearing collar rank patches in the open. How true is this?

Edit:Oh sorry.I should have typed out "Sino-Japanese war soldiers" in the title instead of "WW2" cause Battle of Shanghai wasn't during WW2
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