Why do you like the robin hood ascetic?
Aesthetic? I assume from the just the folklore aspect of it all and the concept of its central themes are what you’re asking about... so...
The reason, over all, why I love the whole “Robin Hood” thing is because they are a group that have - realistically - no reason to be connected at all.
They’re from different places, different walks of life, with different upbringings, different goals, different skills... etc.
They have no business being a group at all, it was all... circumstances (those circumstances actually just being Robin himself) that brought them together.
And in grouping together become much more than the sum of their parts... through everything Robin Hood and the Merry Men (Maid Marian included) choose to do what is right... not because it’s easy, not because of a reward, but because it is simply right and nothing more.
Take one part found family, add a sprinkle of self-sacrifice, a smidge of hero complex, a dash of strong competent female characterization, with a lovely cherry on top made from conscious moral actions of helping those in need and fighting imperialism.
If you’re asking just like... actual aesthetic... I like tights, what can I say?