I would recommend doig the same color for hands and feet, just seems more put together in my opinion. Do color club's nail polish in revvvolution if you want a trendy/cool look. It's an awesome black holographic polish. For something more glam try zoya's kotori which is a shimmery/sparkly midnight blue. If you want something super girlie and classic try any sheertone nude or pink color you own or get a French mani/pedi. Hope this helps!
You could have almost any colour try a bright colour to add some life or a nude beige or cream would make your outfit look very classy. I would be carefull though if you go with a dark blue or black it may look abit too much with your outfit.