You asked her if she wanted to grab coffee. Then you asked if the time worked. Then you asked if the place was okay. Then you asked if she'd prefer tea.
Four questions. Four chances for her to say no. Four signals that you're terrified of making a decision.
Plan it. Pick the place. Pick the time. Tell her where to meet you. She'll either show up or she won't.
Either way, you look like a man instead of a scared little boy.
Generally speaking you cannot reliably judge according to looks, behavior is the defining characteristic of anyone (male or female).
I could talk to any woman I wasn't attracted to. Charming, funny, relaxed. Then a gorgeous woman looked my way and I'd become a sweating, babbling mess.
The fix took me years to find and ten minutes to learn. Nervousness and excitement are the same physical state — pounding heart, adrenaline, flushed face. Your brain just picks the label. And you can pick a better one.
Rule 16 shows you how. You feel the nerves, relabel them as excitement, and let that energy pour out as enthusiasm. Women notice the guy radiating it. They always do.
not every slut dresses like one, some like to try and hide it, some don't live in places where it's feasible (like, a slut who lives in the cold part of russia probably doesn't wear a mini skirt, but that doesn't mean that cold places don't have sluts, ditto for socially conservative countries)