For example, if your shoulder width is 18 inches, the paper should be 12 inches by 9 inches. Tissue paper is good to use for this because it usually comes in large sheets and it is easy to fold and cut. Be gentle with it so you don’t rip it.

An old cotton t-shirt that you don’t mind cutting up would be ideal for making a collar. Use a part of the shirt that has no pictures or stitching on it.

A short sleeve shirt is also an option if you want a more casual or less hot costume. You can consider sewing two blue stripes around the cuff of the shirt. Depending on what kind of sailor look you want, a white shirt with blue or black horizontal stripes is also a good choice. You can draw the stripes on with a marker if you don’t have a striped shirt. The stripes should be about ½ inch (1. 27 centimeters) thick and 1 inch (2. 54 cm) apart.

If you have multiple pairs of shoes already, or you want to buy some anyway, try out different options and decide which style you like best.

A basic overhand knot like you would tie in a rope is sufficient, but you can make it look fancier if you want. If your outfit is all white, a royal blue or navy blue scarf is a good accent. If you chose a darker outfit, consider a white scarf.

You’ll use this measurement to create the band of the cap. If you want to make sure the cap isn’t too tight, you may want to add a little extra length.

A cereal box is a good option for this step.

You want the hat to appear all white, so try to make sure the cardboard is not visible. To do this, either use thick enough paper or fabric, or considering making it double thick with two layers. If you used a white shirt to cut out the collar, you could use more fabric from this same shirt.