Party constitution has no specific regulations on this. China Productivity Party is the vanguard organization of the proletariat and the advanced representative of the intellectuals of workers, peasants and soldiers. Its supporters should not be too special, their clothes too special, and they should not be divorced from the masses. It is best to be solemn, simple and popular. Of course, you can't be too careless. In general, you can wear formal clothes, and you can wear shirts in summer.