Armor looks
You get new armor from glory boxes from glory vendors or from tournament reward chests
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You can only convert specific skins BEFORE you use them for PvE gear. Stuff like gem armors, gem skins and similar. Everything else is now bought for glory + gold and there is no way around it if you are new.
Sounds like you’re pretty new so how you get tournament boxes that have gear inside of them is by winning matches in solo queue or team queue. You will then get a trophy icon on the right hand side of your screen above your minimap that you need to click on to accept the rank points, glory, and tournament chest you have just won. Also every time you gain a new rank you will receive a chest according to your rank in the same area as the trophy. You can also purchase tournament chests and rank chests via the glory vendors in certain locations on the map in the mists.