Casual doesn't bother me, but I can't stand sloppy. There is a difference IMHO. I don't consider makeup-less sloppy, sloppy to me are clothes that weren't looking so hot when they were put on ("fresh out of the hamper" look

).
I don't wear a ton of makeup normally, I'm pretty lucky to have decent skin, but I still wear tinted moisturizer with SPF at the parks. I top that with powder. I put on some mascara, and for my lips one or two things: I use lipliner to line AND fill in my lips, then top with a little lipslick for moisture (this lasts FOREVER), or just use the tinted lipslicks by itself. I have a deep aversion to the "oil slick" look, and would be sure to at least frequenty blot my face with a tissue if I didn't want to powder it. But personally if I was looking that bad, I'd go into a restroom, rinse off my face and then repowder. But that's my own little pet peeve
My hair is too thin and my forehead too broad to go bangless and simple ponytail, but I envy those who can. I can't stand sloppy bangs, or limpy stringy anything, so I just blow mine dry with the little curly brush to keep it from plastering to my face if a I get a little "glisteny", and they stay fairly well kempt and "Tailored". I can't stand hair on my neck when I get hot, so I twist it up and clip it. It's casual, easy, but feminine. I find that the Frizz Ease Hairspray goes a LONG way to keeping hair from totally freaking out in the humidity. Just a little spritz on the sides and to the bangs to keep them from curling/poofing mercilessly but without looking helmety
As for clothing. I'm a..well, let's just say "curvy" girl. Shorts are not just a "no", but a "heck no" for me

I like to wear capris and a Tee in the baby doll shape. Well ironed...I know it sounds weird, but I swear ironed clothes stay cooler for longer since they don't cling as much. I wear tennis shoes, which I've always hated wearing, but it's a necessity. Still, I stay fairly cool and comfy, but don't look sloppy.
I know this sounds complicated, but all of this takes me like 10 minutes and I'm out the door! I'm not a natural beauty in the morning

If I tried to just roll out of bed and go as is, by the end of the day I would personally look twice as bad as road kill. Though I get just as tired and wilted looking as the next person, it's rarely anything I'm embarassed about in pictures b/c I started out groomed (though that does not mean I don't do the usual 'gah! I'm the least photogenic person in the world!'

)