appropriate would most likely be anything that isn't too revealing.  In some gym pools I have seen guys swim nude or in jock straps. I have also seen guys wearing nylon jogging shorts that turn transparent when wet. Those are not appropriate when in mixed company. 
Of course, this may be a radical concept but, why not ask? 
		
	
		
		
		
		
		
	
		
		
	
	
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