I like the idea of getting bonus hats, but...

[Svens]

...please don't leave out any new, upcoming NMs from all the fun too. Empower them with masterfully designed headpieces as well to show us adventurers whose really the boss. Take Titlacauan and Mictlantecuhtli for instance:

http://images.wikia.com/ffxi/images/1/17/Mictlantecuhtli.jpg
vs.
http://images.wikia.com/ffxi/images/8/86/Titlacauan.jpg

Mictlantecuhtli, a meager corse without a hat is quite a pushover, even with his ability to absorb damage. But with a badass hat, Titlacauan means business, opening up with Death, charming repeatedly, and killing adventurers sadistically not with the high damage from Hadal Summons, but lowering their health significantly so that burn/spikes finishes them off instead.

While the corse NMs are humanoid in structure, let other non-humanoid NMs wear hats as well. I wouldn't mind seeing cute, but deadly things as well such as an apkallu NM wearing a corsair's tricorne...with a bearded hume fomor corsair pet. Or a mandragora with a miniature shadowreign gigas helmet. Anyone else have NM/hat combinations they'd like to see for future NMs?

[Mrbeansman]

Okay now this is something I can get behind.

[Zyeriis]

A Mamool Ja wearing a helmet made from a Galka's head.

A Yagudo wearing a turban made from a Mithra's head.

An Orc wearing a beret made from an Elvaan's face.

A Malboro wearing a bunch of Aurore Berets.

[Aaradia]

This is the best suggestion I've ever read on these forums.

[Zyeriis]

Rani needs a Maat's Cap.
Think about it.

Rani uses Maat's Cap.
Rani teleports to Ru'Lude Gardens.

[Dallas]

I'm almost positive Briareus donated to the relief fund, will he be getting a moogle hat too?