If you don't wanna wear flip flops, go with flats...they should provide some good support for your ankle just in case too! :)
Is it slutty? well how long is the skirt? at your but? at your knee? in the middle? Everybody has different lengths of arms...I have friends who, if they wore skirts down to their fingertips, could be wearing the skirt as a shirt... LOL but that's beside the point ins't it? haha It's probably not slutty...
Honestly red nail polish? :p it's a little overrated... If I were you, I would go with electric blue, bright purple or lime green... Go with the hot color trend that is going on right now...it's so fun! I don't know how yellow your tank top is, but check out what she did with yellow pants: link I just think that's the best... But then again I'm a funky bubbly person who loves color...If that's not you...do what feels right! :) Be yourself.
ya the black skirt is sexy. Halter top is ok. The flipflops are okay but high heels are much better. Rednail polish is pretty slutty and not hot. Depending on how far your finger tips go for you. If your skirt is way too short you may look slutter. If its past your knees it makes you look old- fashioned.
I think the outfit has potential. I might rethink the color combinations. It seems like you'll look like a bumblebee with the yellow and black. I would keep the black skirt, but pick a different top (and color), especially if the skirt is a micro-mini. And I would also not put on the red nail polish.
No, not slutty at all. If you are going to show one thing, hide the other. Like if you are showing cleavage cover your bottom more. If you are wearing really short shorts cover your top a bit better. And flip flops with mini skirts are very cute and not slutty. The skirt coming down to your fingertips covers plenty.