IIS Hosted WCF Service & SQL Queries Using Windows Authentication

I'm fairly new to WCF but I have a WCF Service hosted in IIS that has several queries to our SQL Server. I am consuming the WCF service with a WPF application. What I'm trying to do is allow windows authentication to pass from the WPF Client, To The WCF Service, To The SQL Server so that the SQL Queries are executed as the clients user. I've been trying to configure the website and host in various ways with no luck so far.I'm fairly new to WCF but I have a WCF Service