Board Thread:The Quarters - Q & A/@comment-49.145.112.212-20160411095750/@comment-27645494-20160412141524

Unfortunately, those features don't currently exist, but one of the awesome things about Habitica is how actively it's being developed and how anyone can contribute their ideas! You can request features by going to Help > Request a Feature. Selling items is a popular request and you can add to the discussion here: https://trello.com/c/CAc4rMno/390-armor-gear-equipment-v2-cursed-items-sell-items-preview-items.

If you'd just like to get back the gold you spent on the Warrior items, you can go to Settings > Site > Fix Character Values.

One last note: I totally understand wanting a complete set, but individual equipment items can be valuable, too! See Costume Carnival for some inspiration on how to mix and match equipment from different sets to dress up your avatar.