Ons is in agreeance with your argument. From a quantitative standpoint it is hard to agree what presentability is. How do you define and measure presentability? And if you cannot then how can you achieve an unmeasureable goal?

Second though is a disgareeance, which is, what is the reason for presentability. Making yourself presentable sets you apart or conforms you and sends a signal. The measure is in your success or failure to send that signal. The quantifying for scientific purpose is not realistic because desires are not static and this you must always change your presentability to fit the situation. Fashions and preferences of an individual always fluxuate and you must strive to meet them if you wish to send a signal. So the measure is quantifiable in the idea that if you achieve the message you are trying to send then you have succeded in presentability. And you can cound that instance as a successful defined incident.

Even the most religoious efforts of presentability are not for the sake of presentability there is always a deeper purpose or message the person is trying to achieve. Unless they happen to be a fashion designer…