All of my clothes are tailored or made to fit (they have to be), so by default, I guess I always look 'put together' when I go to the grocery store or 7-Eleven.
Like Gkisses said, some people can throw their hair in a ponytail or a neat chignon, nice fitting jeans, a t-shirt and a blazer and look quite nice. Others - they may need a bit of help.
I think if your clothes fit you well and your hair is groomed, then you should at least look decent.
...but I aint gonna lie and act like I wasn't up in the Home Depot today in a t-shirt, shorts, cardigan and sandals...Plain Jane.
As far as makeup - it is 90 degrees in the shade down here. Ain't nobody got time fo' that. So long as I keep my eyebrows groomed ('cause dem joints can get out of control), then I'm doing ok LOL!