Guild Wars 2

When can we expect to get these items again? Missed the last time they were available at the gem store

I think they are one of the items that rotates, so maybe in 3-6 months, if they are not added during a sale over December.

Warning: Pure, undiluted speculation incoming.
I wouldn’t be the least surprised if they make a return within the next few weeks, given the upcoming Nightmare Fractal and its connection to the Toxic Alliance.

Redditor Delsea has a fairly up-to-date list of what’s been in the gem shop recently:
https://www.reddit.com/r/Guildwars2/comments/5d39er/marjorys_shrouded_outfit_available_in_gemstore/da1fa4k/

According to their tables, these were last made available in August of this year. So unless Tanner is correct (and they return due to a tie-in with the new fractal), I wouldn’t expect to see them anytime soon. (That’s my speculation.)