Draw an oval

Draw two lines. These will form the overalls.

Fill in the rest. You will now see the formation of the overalls

Don't forget to add the pocket :)

Next draw the eye (or eyes) in the goggles.

Draw the strap for the goggles and you can add a smile :)

Add arms with gloves. (Mine are terrible)

Then add the legs!

Here is the finished picture!