Ai Hoshino Cosplay
Oshi no Ko's beloved idol star brought to life. The signature star-shaped eyes, bright pink hair, and white idol dress are instantly recognizable, but getting the dress silhouette right and handling the star eye contacts takes planning. 5 components, 12 materials, ~5-6 weeks, $150-320.
6 weeks
12
12
5
See the whole look before you start.
References, materials, budget, and build order for Ai Hoshino.
Timeline
6 weeks
Color refs
Materials
12 items
Budget
$150 - $320
save the visual refs
Full reference board
The preview above is curated for scanning. This is the working board you clone into your own build, with notes, colors, product images, and extra references intact.
Images are sourced from around the internet to help you get started. Use the web clipper to build your own reference library.
Build guide
I made Ai's dress twice. The first collar was too soft. It collapsed against her neck like a sad pancake, and no amount of safety pins could save it.
The collar is the entire costume. Get it wrong and nobody sees Ai Hoshino. They see "girl in a white dress with a weird neck situation." Heavyweight interfacing, fused to both the fashion fabric and the facing. Not fusible fleece, not a single layer. Actual woven interfacing like Pellon Decor Bond or equivalent. Your fusible has to bond permanently. When you press it, it should feel like armor.
The dress itself is less fussy. Reference the show frame-by-frame for proportions. Ai's dress hits mid-calf, the waistline sits at her natural waist (not empire), and the collar stands perpendicular to the neckline. Use a basic princess seam or gathered dress pattern as your base. Modify the neckline to accommodate that standing collar. Cut a facing, fuse your interfacing to the inside of the facing so the collar has structure on both sides, and set it with a regular neckline seam. The key is fusing the interfacing to the facing first, not trying to fuse it to your fashion fabric and expecting it to hold.
The pink wig is the second make-or-break detail, but for different reasons. Buy Arda Wigs 0 Bubblegum Pink or equivalent from Epicosplay. Not Amazon. Not a generic "hot pink" costume wig. The hex code you want is somewhere near #FFB6F2. Cosplay-specific sellers will get you close. Check the swatch if they offer one.
Once you have it, don't just pin it to your head. Tease it. Properly. Section-by-section from the roots with a fine-tooth comb. Blow-dry with a round brush to add volume. It should look lived-in, not plastic. Then lock it down with Got2b Glued (gel or spray) and a wig grip band worn under the cap. The grip band is not optional if your wig is over 100cm. You'll wear this for 8+ hours. It will slide without support.
The star eyes are where most people lose time deciding instead of building. Here's the framework: star contact lenses ($35-60 from Pinky Paradise) read perfectly on camera but reduce vision and comfort. White cream makeup and eyeliner painted directly on your eyelids is safer and faster but only works for photos. Neither choice is wrong. Just pick one and commit. Practice the makeup 5-10 times if you go that route.
Small foam stars for hair and dress accents. Negligible. Cut them from 3mm EVA foam, paint with acrylics, attach with magnets or sew them. Twenty minutes of work.
Total timeline is 5-6 weeks if you're efficient. Week one: wig and contacts ordered. Week two: pattern drafted or modified. Weeks three-four: dress construction (mainly the collar). Week five: wig styling and eye work. Week six: finishing details and wearing it around the house to identify what breaks.
Budget $150-320. The wig, interfacing, and contacts drive cost. Everything else is standard dress-making supplies. If you already own makeup and wig tools, you're on the lower end.
The dress will be the thing you're most proud of if you get the collar right. That standing white collar is exactly what makes her an idol and not just a girl in a white dress. So buy good interfacing, test-fit your collar mockup, and fuse it properly the first time. You won't regret it.
Components
Pink long wig
Star eye makeup and contacts
White idol dress with collar
Star accessories (hair and outfit)
Footwear and finishing
Materials list
12 itemsEstimated total cost
$150 - $320
Milestone timeline
6 weeks- 1
Gather Ai Hoshino reference images from official art and episodes
Research
- 2
Order and test-fit the pink wig, confirm color match to references
Materials
- 3
Decide on star eye approach (contacts vs makeup) and order if needed
Materials
- 4
Draft or modify a dress pattern to match character proportions
Patterning
- 5
Mock up the dress collar in scrap fabric to test the standing angle
Patterning
- 6
Cut and sew the dress body with zipper
Construction
- 7
Interface and attach the standing collar to the dress
Construction
- 8
Style and tease the wig, set with Got2b Glued
Finishing
- 9
Cut and paint foam stars for hair and dress accents
Finishing
- 10
Practice star eye makeup or fit and test star contacts
Finishing
- 11
Full wear test and walk-around in complete costume
Wear test
- 12
Prepare con day touch-up kit with wig products and makeup
Packing
Frequently
asked questions.
Related tools and guides
Plan your build, estimate costs, and get ready.
Budget Calculator
Estimate your build cost before you start buying materials.
Convention Checklist
88-item packing checklist. Check off items as you pack.
Prop Scaling Calculator
Scale reference images to your body measurements.
How Much Does EVA Foam Armor Cost?
Real build budgets with specific products and dollar amounts.
Cosplay on Costumary
Templates, tools, and workspace built for cosplay makers.
Browse all templates
Explore build plans across 10 craft verticals.
Debut your cosplay build
Upcoming conventions where you could wear this. Dates, checklists, and budget tools included.
Start this build free
Clone this template into your workspace. Track materials, milestones, budget, and build progress in one place.
More from this series
Qifrey Cosplay
5 weeks · 12 milestones
Qifrey's elegant white-robed silhouette is built around three signature elements: the tall pointed hat with the bent tip and black ribbon, the flowing white cape with the brass brooch closure, and the asymmetrical pince-nez glasses with one dark lens hiding his scarred eye. This is an intermediate build that needs more structural crafting than sewing. The hat and glasses demand the most attention, while the cape is a manageable garment project. The glasses and the hat are the make-or-break details, and this template walks you through both. Includes 7 components, 15 materials with cost estimates, a 12-step build plan, and a realistic 5-week, $95 to $280 budget.
Gojo Satoru Cosplay
5 weeks · 11 milestones
Jujutsu Kaisen's strongest sorcerer, built around three signature details: the black high-collar uniform jacket, the blindfold, and the white spiked hair. This is an intermediate build that leans on one well-made garment plus wig styling, so it reads instantly on the con floor without months of work. The collar and the wig are the make-or-break details, and this template walks you through both. Includes 6 components, 11 materials with cost estimates, an 11-step build plan, and a realistic 5-week, $90 to $240 budget.
Spider-Man Suit Cosplay
5 weeks · 14 milestones
The classic red and blue web-slinger: a 4-way stretch spandex bodysuit with raised web lines, front and back spider emblems, white framed lenses, and wrist-mounted web shooters. This is an intermediate build. Spandex is forgiving if you use a dress form and take your time on the web lines. Covers 7 components, 11 materials with cost estimates, a 12-step build plan spread across 5 phases, and a realistic 5-week, $80 to $250 budget.
Armor Build
8 weeks · 14 milestones
Plan and build a full EVA foam armor set from reference images to convention floor. Covers patterning, heat-forming, sealing, painting, and strapping for cosplayers stepping up from simple pieces to a complete suit.