A FOMO Sale is only available on some Limited Edition items and functions very similarly to a Dutch Auction.
The price is initially set high but over time the price is reduced in predictable increments and time slices until it either hits the minimum acceptable price or the item is sold out.
If you find the price of the item acceptable, don't hesitate to buy, otherwise you'll miss out!
During a FOMO sale you may only add a single sale item to your cart. This is to ensure other buyers have a fair chance at purchasing items. Once you have paid for the items in your shopping cart you may purchase another item.
When you add an item to your shopping cart, the item is reserved for you for 15 minutes at the price when you added it. If you don't complete your purchase before the reservation expires, the item will be added back for sale.
If you remove an item from your cart it will be returned to sale and will assume the current sales price, including being available for other buyers.
Once all items have been sold and the item is out of stock, the item sale page will be removed. If items either expire their reservation or are removed from a shopping cart after the sale page is removed, they will not be offered for sale.

An Outfit with 100 supply is listed at $100 USD and reduces it's price every hour by $10 USD until it reaches the minimum of $10 USD.