All girls are date-able however it depends on the conditions more so... ie, the guys/girls mood, the place, and the persons values/attitude.
Case in point... the club is a hook-up place, very rarely does anyone attend a club to find their soul mate. Most peoples attitude is... I am here at the bar with my friends so just don't bother me. The music is loud and difficult to talk so lets just not bother.
Conversely, if the guy meets a girl in the library or at a function, and he has his wits about him (ie., no cup of courage), then he is likely interested in the girl for dating purposes. His mood is open, the place is not a meat market, and the girl usually has an open attitude and it is easy to talk to also.
Don't fling yourself onto a guy. Don't flaunt your physical attractiveness onto a guy because then they will just take that as the incentive to use you for sex and booty calls but nothing else. A girl is date-able not only by her looks but by who she is as a person... smart, funny, outgoing, shy, loving, caring, determined, athletic,... sharing similar traits with the person she is trying to date... Id date any girl who held the same traits and likes as I do but wasn't a 10/10 anyday. Looks only take you so far and usually it just leads to the bedroom and thats it.
It depends but for me, if they have a great personality, common interests, and we click then I'd consider dating. If she lacks those things and is only physically attractive or just wants to hook up then yeah just hook up material.
A personality, someone who makes an effort to become aquantinces first before thinking about dating shows the guys that she wants something more than a hookup. Like flirting is welcome but go on a date first before going to anyone's place.
Cliche alert! It depends on the guy. It's overstated because it's true. I have friends who regularly try to date women I have or would've just hooked up with. Their criteria for dateable is just entirely different from my own. Some only date the hottest girl they can fine. Others only date girls that don't seem like "sluts". I personally have four criteria for women I date vs only hookups. Is she attractive to me? Is she interesting? Do I feel comfortable with her? Is she trustworthy? If she's a yes to all four I date her if not I'm moving on.