A non-primitive female, or short non-primitive, is said to be non-slutty, innocent and have a slow life history speed.
A commonly fallacy in incel forums is that many members say that they could tell if a woman is slutty or innocent by her face or the way she dresses. However this is not true. Even the most innocent looking females have a slutty past because it is easy for females to be hypergamous and being hypergamous will inevitably prevent them from getting long-term relationships. This will lead to them having a series of short-term relationships and one-night stands, racking up their laycount. So sexual dynamics will inevitably force every female (no matter how "innocent" she looks) to become slutty unless they "settle" very early for a looksmatched partner.
A common idea is that Asian men are with "non-primitive" women. This is far from the truth. The majority of these women probably had a slutty past, and are just settling. And, if any break-up occurs, she will resume her slutiness.
A woman's past slutiness could not be judged by how she currently dresses. Women change their attire depending on whether she is looking for casual sex or a long-term relationship. If a woman decides to "settle" she will inevitably dress less slutty.