There isn't a direct price guide anymore; some people use the discord server to ask. Some people use the trading forum here as a price check. Others use the AH averages.
Honestly; I would go with a price you feel comfortable with and put it in AH perhaps, or go to an open auction event for wearables and people will bid what they feel is worth.
Run items you want to sell on Auction House, I'd recommend starting with things you don't want and sell them on estimate. There's also following the 50:1 rule on most items. Ultimately you as the seller sets the price you want