How to Draw Japanese High School Girl Sailor Uniforms (Summer & Winter): A Step-by-Step Guide by Japanese Pro Artists
If yours keeps coming out as a white shirt with a blue bib, the collar and the pleats are usually why. Here's the summer set, the winter set, how each piece is built, and what the cloth does when she moves.

The five steps at a glance
01
02
03
04
05
Step 01 · Summer set
What does a summer sailor uniform look like from the front, side and back?
Short sleeves, a wide collar with two or three lines, and a pleated skirt. Draw all three views before you pose her.The summer top is cut from cloth a little firmer than a dress shirt, so the creases come out straight. The sleeves are short and end in a cuff with a line on it, matching the lines that run around the collar. Under the V of the collar sits a small chest panel.
Now look at the back view. The collar isn't a bib that stops at the shoulders. It runs over them and drops into a square flap behind. The side view shows the thing most people miss: a zipper down the side seam. The skirt is pleated, most often with 24 pleats.

Step 02 · Winter set
How is the winter sailor uniform different from the summer one?
Same shapes, heavier cloth, long sleeves. The line on the sleeve moves down to the cuff at the wrist.Nothing about the design changes. The weight does. Winter cloth is thicker than summer cloth. The sleeves run to the wrist and end in a cuff with a line on it.
The scarf changes with the school: red, white and navy all turn up. There's still a zipper on the side, and the side view is where you'll see it.

Step 03 · The top
How is a sailor top actually built?
The one shown here is a pullover. A hook closes the collar at the chest and a zipper opens the side.Lay the top flat and it makes sense. The V of the collar is closed by a small hook at its point, done up after the top goes on.
The opening is on the side: a zipper running up from the hem. That's why the front stays clean, with nothing breaking it between the scarf and the hem. Once you know where the hook and the zipper are, you stop adding fastenings that aren't there.
Illustrated examples
Step 04 · The skirt
How do you draw skirt pleats that don't look flat?
Pick a vanishing point above the waist on the skirt's center line, and fan every pleat line out from it.Pleats drawn as parallel stripes turn a skirt into a barcode. Real pleats spread. Extend the center line of the skirt upward, pick a point on it, and pull each pleat line down from that point.
Then watch the spacing. The pleats get narrower the further they sit from the center. As for how it fastens: there's a metal hook at the waist, and the zipper hides in the valley of one pleat.

Step 05 · Movement
What happens to a sailor uniform when the character moves?
The top is short, so it follows the arms. The skirt opens wherever the legs push it.Raise her arms and the whole top goes with them. The hem lifts off the waistband and the layer underneath shows. Two kinds of wrinkles turn up: fold wrinkles where the sleeve bunches, and pull wrinkles running from the armpit.
Sit her down with her knees up and the skirt changes too. The thighs push the cloth up and pull it tight, so pleats that were folded shut come out and open. Picture a folding fan spreading.

Arms down, arm raised
Same character, same top. The only thing that changed is one arm.
Arms down: the hem sits at the waist.
One arm raised: the short top is pulled up with it.
Where people usually get stuck
My pleats look like parallel stripes.
Fan them out from one point above the waist, and make them narrower toward the sides.
My collar looks like a flat sticker.
It wraps over the shoulders into a square flap at the back. Draw the side and back views once.
The uniform goes stiff as soon as she moves.
The top is short. Lift the hem when the arms go up, and open the pleats when she sits.
Sailor uniform drawing FAQ
How many pleats does a sailor uniform skirt have?
Most often 24. When you draw them, fan the pleat lines out from one point above the waist so they don't look like parallel stripes.
What is the difference between a summer and a winter sailor uniform?
The summer set has short sleeves and lighter cloth. The winter set has long sleeves with a lined cuff and thicker cloth. The collar, the scarf and the pleated skirt keep the same shapes.
How do I draw the sailor collar?
Treat it as one piece of cloth that runs over the shoulders: a V at the front, a square flap at the back, with two or three lines following its edge.
How do I get feedback on my sailor uniform drawings?
When you join an Anime Art Academy course, a professional Japanese artist gives you personal advice and draws red-line corrections directly on your drawing. There is no limit on how many times you can submit. The only rule: post one drawing at a time, and wait for your teacher's reply before posting the next.