Step 16: Add a few more lines around the Cat in the Hat's face for extra detail. Draw a couple of lines and dots on either side of the head for whiskers and some over the eyebrows.

Step 17: Now draw the Cat in the Hat's hat. Use the line on top of the head as a guide to draw the brim of the hat. Follow the basic path of the line as you make the shape thicker and darken the lines. Make the ends of the shape rounder.

Step 18: Draw the top part of the hat by using the rectangle-like shape as a guide. Follow the basic path of the shape as you darken the lines and make the hat rounder and bulgier. The top of the hat bulges out to the left.

Step 19: Draw a few lines inside the shape of the hat for the stripes. Draw the lines as broken-up strokes instead of single straight lines to emulate Dr. Seuss' sketchy style.

Step 20 (optional): Under the Cat in the Hat's neck, draw a big bow using a few curved lines.