I would not recommend this. Even if you treated the hide, you still cut it up with a small knife, so I'll assume a halberd or even a sword would cut through it like butter. Maybe not, but then you have to remember that it's probably not going to hold up against the force and might collapse in on you.

Then again it can look badass as an ornament, taking drake's hide and making a dope cape out of it - maybe even a coat of arms (Like the actual coat of arms... Like an actual coat - not the heraldry.). Then have rows of demon teeth as a necklace or smth. Maybe carve a giant's head into a crown and use the rest to make a throne?

Remember that the Aztecs were limited in their access to metal, so they needed protection from blunt instruments and arrow heads. The Macahuitl, which had short segments of obsidian blades along the edge, were used for shallow cutting, rather than rending, and the more you used it as a club the more prone to breaking the obsidian was.

Against these kinds of attacks, hides were effective. As well, hides are much quicker to prepare and use than cured or boiled leather, which takes a much larger amount of work and access to curative liquids as well as a drying rack.

Addendum: As well, the Aztecs used an underweave of thick cotton to bond their ornate hide armor, so it was thicker than just an animal skin and capable of catching and impeding arrows. Many of the Spaniards who came to Central America exchanged their heavy, overly hot breastplates (which protected quite well from the swords they carried) for the cotton under-armor the Aztecs made, as it was far cooler to wear in the hot, humid climate. Many men actually collapsed or died from heat exhaustion because of their insistence on keeping the metal breastplates on.