You will need to create or modify your Global.asax to include the following code.
void Application_BeginRequest(object sender, EventArgs e)
{
string fullUrl = Request.Url.ToString();
if (fullUrl.Contains("/products/suiting.aspx"))
{
Context.RewritePath("/products.aspx?category=suiting");
}
else if (fullUrl.Contains("/products/jackets.aspx"))
{
Context.RewritePath("/products.aspx?category=jackets");
}
}