Lol, since when do guys care about outfits? Perhaps if she were dressed in a catsuit made from the leather of freshly skinned babies I'll consider skipping the date, but other than that, I can't say I care much.
That's really not cool to be so controlling of what you wear that he won't even let you go with the more comfortable option in hot weather. Sounds to me like he has control issues and is being over possessive.
Yes, she only dresses like a slut when I allow it.