apart from the iconic tea cup, there's the iconic jacket.
to get one, just search 干部夹克 (cadre jacket) or 领导夹克 (leader jacket) on taobao
I think the rule is if the top leader wears a cadre jacket then everyone has to follow suit by not wearing a suit.

P.S. I had a fantastic thread last year (can I call my own thread fantastic?) on Zhongshan suit https://twitter.com/chenchenzh/status/1186948486392156161