Based on my headcanon where Rythian wears high heels
wears “Ender Shoes” to make himself taller since Endermen magic requires considerable height to work properly
said shoes have been enchanted to not cause discomfort and aid in battle
said enchantment also prevents anyone from seeing them and they’ll just see Rythian being really tall
All Endermen wear high heels to look imposing and aid in magic requiring physical height (thus the taller you are the better your magical abilities and you’ll scare off predators from your threatening height)
They developed teleportation because running in those heels would be hell (Rythian found a way to make them comfortable thanks to his knowledge of magic and alchemy in Minecraftia - he placed enchanted Ender Pearls in the shoes to switch the laws of discomforting heels in our reality with one that makes them extra comfortable and functional)
i guess there’s an alternate reality where not wearing heels is super painful
Ender Shoes can’t be seen due to the influx of teleportational rifts interfering with the fabric of reality. Basically, Endermen teleportation has a draw back on physical items because of their reality altering magic - such as their shoes and pearls - so they fail to materialize and be seen. Instead, reality tries to fill in that visual gap by making it seem like Endermen are just naturally tall. This illusion is destroyed when an Enderman is defeated, but the shoes disappear with the Enderman due to their strong magical link with each other (defeated Endermen disappear faster than the shoes take to materialize).
Ender Pearls don’t disappear since they contain natural teleportation energies to stick to the reality they’re currently in, which is why you see them getting “dropped” (materialized) by vanquished Endermen.