Have noticed this often, on days when I have nothing pressing and don't have to go out, my skin is radiant, my hair behaves itself and I look fabulous.
Less so on the days where I am due in public.
It happens so often, over time, that it reminds me of the way toast will usually always fall buttered side down 
It's the murphy's law of style and beauty, surely?
I made some small alterations to a coat this morning, had barely brushed my hair and no make up. Was also bringing a few winter items out to try on, and looked positively glowing in the mirror - the self same mirror that will make me look like a rats arse come tomorrow morning.