"Just Feeling Like It" Obviously Not Good Enough

I've recently decided that I want to start dressing nicer so I started to buy clearance dresses and such and I'm enjoying myself. Everyday I get a, "You look nice, why are you so dressed up?" Now, I don't mind being asked but then when I reply with a "I just feel like it." I get a look like I'm crazy. I don't understand why I look like a crazy person because I want to look presentable.