Question: Among all customers handled by Innes E. del Castillo, how many have purchased Short-Sleeve Classic Jersey, L?
SQL: SELECT COUNT(T2.CustomerID) FROM Products AS T1 INNER JOIN Sales AS T2 ON T1.ProductID = T2.ProductID INNER JOIN Employees AS T3 ON T2.SalesPersonID = T3.EmployeeID WHERE T3.FirstName = 'Innes' AND T3.LastName = 'del Castillo' AND T1.Name = 'Short-Sleeve Classic Jersey, L' AND T3.MiddleInitial = 'e'