9th Anniversary Discussion

The 15th day of the attendance gives you the Black Pendant, but I'm not sure exactly what's needed for the chair.
"Collect six different types of 9th Anniversary Black Equipment."
So a weapon and 5 other equips, or 6 equips and no weapon?

Hat, Gum, Suit, Cape, Pendant, and your choice of Weapon.
If you hover your cursor over the achievement it will list the requirements.