This is my vanity set , it is called the celestial display and it consists of:
1)Antena
2)Daylight chestplate
3)Nightshade shoes
The Antena has some aliens circling around the player's head ! ( either a buff or some sort of animation )
Descriptions: 1) " This strange antena seems to attract all sorts of weird creatures " / " On the inside there are all sorts of contraptions that attract aliens
2) " The sunlight reflects of this artifact in a wide spectrum of colours "
3) " Every night the moonlight seems to be sucked up by this thing making everything a little darker " ( does not reduce light level )
The vanity set would be obtained from the sky chests in the sky islands
Extra (if the devs want to implement): At night the Nightshade shoes start to sparkle and if you look closely at them you might even see a star.
While it is morning the Daylight chestplate's yellow parts will change color slowly to orange as the sunset comes.
I think that this is a good vanity set because beside the Enchanted Sundial and the martian invasion that are in hardmode we don't really have that much that has to do with the solar system in pre-hardmode