OK, I don't think you know what a social construct is in the first place.
Haircuts are social constructs - it's fairly natural to HAVE hair, but the way we style it is 100% a matter of pure fashion. Bangs and braids mean only the significance that our culture has given them. But even knowing that, people still GET haircuts, don't they? In most cases, people will spend quite a bit of their income on it.