Every time I plan a cosplay I treat it like a mini detective case—so for 'Kenji' from 'Bungo Stray Dogs' I start by collecting as many clear reference photos as I can: front, back, close-ups of hair and shoes, and screenshots of expressions. That gives me the blueprint. Once I have references, I break the costume into parts: base clothing, wig and hair, makeup/face details, props, and behavior/poses.
For the clothes, I hunt for a blazer or jacket in the right cut and color (if you can’t find an exact match, pick a close one and alter it). Layer a crisp white shirt and add whatever tie/scarf detail Kenji wears in your reference. I often buy a cheap blazer a size up and tailor it—take in the sides, shorten sleeves, add trim if the character has it. For trousers, choose a straight cut and weather them slightly with sandpaper if the character’s look is lived-in.
Wig-wise, grab a short silver/ash wig a little longer than the desired finished length; I trim and thin wigs with sharp shears and use a flat iron (low heat heatproof wig) to spike or shape. Makeup is light—base, subtle contour to mimic animated shading, darker brows (color-matched to wig), and a bit of eyeliner to make expressions read from a distance. Practice Kenji’s smile and tilt; small facial ticks sell the cosplay. For props, pick lightweight materials (EVA foam, craft wood) and finish with sealed paint. On con day I pack a small repair kit: needle, hot glue, safety pins, and extra wig pins. I love how a few costume tweaks and the right body language can turn a pile of clothes into a convincing Kenji—it's wildly satisfying when people do a double-take.