So i bought a chestplate that i did not want. Can i sell it and buy something i actually need?
https://discourse.codecombat.com/t/equipment-selling/21994/10
Does that answer your question?
Hi @A_I1 and welcome to the forum! 
It is not possible to sell equipment unfourtunally right now in Code Combat, but there might be something like that in the future.
Andrei