Write SQL query to solve given problem: Who is the customer who purchased the largest total cost of products in a single order?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.`Customer Name` FROM east_superstore AS T1 INNER JOIN people AS T2 ON T1.`Customer ID` = T2.`Customer ID` GROUP BY T1.`Order ID`, T2.`Customer Name` ORDER BY SUM((T1.Sales / (1 - T1.Discount)) * T1.Quantity - T1.Profit) DESC LIMIT 1