I was trying to write " Don't forget to cover this part.....talking about the neck", for this hijab style I will recommend you use a Full under scarf which will cover you perfectly and then you can style the hijab above it.
You will need: An under scaf (cotton preferably), 2 oblong scarfs (use light fabrics like cotton), and pins.
**Tip: If you are worry about the heat using under scarf and more than one hijab together, then you can use a cotton under scarf which will help you to feel more fresh.
You can also change the style of the hijab for something more shinny or sparkly if you are attending an special event.
Twist the rest of the Hijab and pin the edges with the rest of the hijab.