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They don't like sleeveless shirts or tank tops. Also, the reasoning for all this might be mentioned. It's an issue of proper respect to them. This is something we foreigners, myself included, don't seem realize immediately or appreciate. After you've been in the country for a while though, you begin to see the "whys" of certain things. I had an outfit always ready in my closet just for the bi-monthly trip.
I just sit inside in the aircon and snicker to me when I see guys roll in dressed inappropriately. I'm laughing partly at me when I look back at my first time there.
Note: Do Not Wear Short And Slippers To The Immigration Bureau. They Will Not Let You In.