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If you have curly hair, consider straightening the section out. This will give you a more authentic look. If you have natural hair, however, consider leaving it as-is, or use braiding hair to create some micro braids, goddess braids, etc. If you have short hair and plan on adding extensions, you must straighten your hair, otherwise the texture won't match. Make the ponytail at the same height as the bun, right next to the vertical part that's behind your ear. The ponytail and the bun should be almost touchingas though they are a single piece. Use a hair tie that matches your hair color as closely as possible. You'll eventually be adding a Sailor Moon clip, but there's still a chance that it might show through. For more volume, split the ponytail into 2 sections and gently tug them apart. This will shift the hair tie closer to your scalp as well as cause the ponytail to fan out. Take a 2- to 3-comb hair extension that matches your hair color and pop open the combs. Insert the first comb into the base of your ponytail, right below the hair tie, and snap it shut. Wrap the extension around the ponytail, then slide and snap the second comb into place. Straighten the extension to match the texture of your hair. For a thicker look, use a 4-clip extension. You can also layer another set of 2- or 3-clip extensions instead. The extensions don't have to be as long as Sailor Moon's hair. You can also totally keep your short hair for a Chibi Moon look. If you have natural hair, consider using braiding hair and creating mini braids instead. with a curling iron, if desired. Depending on the thickness of your hair, you may have to curl the ends in multiple sections. Once you have finished curling them, however, gather them together to that they make one, big curl. Don't curl all of the ponytail all the way up to the ponytail. You just need a single coil. If you put your natural hair into braids, you can still curl them by wrapping them around curling rods, then dipping them into boiling water for a couple of seconds. Undo the bun and straighten it, if desired. Pull it into a high ponytail, then add a clip-in extension if you want your hair to be longer. For a more authentic look, add a single, large curl to the bottom of the ponytail. This is completely optional, but it is a nice touch. Depending on the style of the clip, you may be able to wrap it around the ponytail as well. These are sometimes referred to as "odango shields". You can buy Sailor Moon hair clips from online stores that specialize in Anime cosplay and accessories. You can also commission someone to make one for you, or you can make it yourself.
Undo the back-left section and comb it out. Pull the section into a high ponytail just behind the left bun. Clip in an extension around the ponytail if you want an authentic look. Curl the end of the ponytail Repeat the process for the right side of your head. Add a Sailor Moon clip to each bun, if desired.