Amongst other places, the game's rarest tailoring pattern drops from the chests inside the Scarlet Monastery, so I'm just reminding tailoring completionists that they can queue for the graveyard wing of this instance at levels 84-85 from wherever they are, by virtue of the current in-game holiday. There are always 2 chests inside the graveyard wing, 1 usually in the torture room and 1 to the right (looking towards crypt) of the graveyard. Occasionally the graveyard one is down on the second level of the crypt.
Queue up, kill the HH, wait for people to leave (some people are stubborn lol), loot the chests. Repeat x5 per hour. To make the most of this you need to have a way of opening locked chests as they'll be locked approximately half the time. This means you need to use a rogue or a character with Engineering or Blacksmithing.
I've picked up two of these patterns so far this holiday, both from locked chests though I don't know if them being locked is a requirement.