Step Brothers Costume
Grab your best friend and become the ultimate middle-aged man-children.
The Step Brothers costume brings the hilarious, arrested-development dynamic of Brennan Huff and Dale Doback to life. Perfect for duos, this look is instantly recognizable from the movie's iconic promotional poster and family portrait scenes. The costume consists of preppy, mismatched argyle sweater vests layered over light blue collared shirts, paired with classic khakis and messy, curly hair.
- Difficulty
- Easy
- Time
- ~15 min
- Budget
- $30–80
Try it on
See yourself as Step Brothers
One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.
One render, $1. No account needed — if it fails you're not charged. Pricing.
Your photo is sent to Google's Gemini API to make the render and isn't used for training. Renders are AI-generated and labelled.
Want a different costume on this photo, or a whole group in costume? Open the Try-On Studio.
What you need for a Step Brothers costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Step Brothers costume — one box instead of 6 pieces.
Brennan's Burgundy Argyle Sweater Vest
A classic knit V-neck sweater vest featuring a burgundy, gray, and white argyle diamond pattern.
DIY: Use a plain burgundy sweater vest and draw gray and white diamond lines with fabric markers.
Dale's Gray Argyle Sweater Vest
A classic knit V-neck sweater vest featuring a gray, navy blue, and yellow argyle diamond pattern.
DIY: Use a plain gray sweater vest and paint blue and yellow diamond patterns using fabric paint.
Light Blue Dress Shirts
Two standard light blue, long-sleeve button-down dress shirts with stiff collars.
Khaki Pants
Classic, straight-leg pleated or flat-front khaki trousers worn high on the waist.
Brennan's Curly Wig
A short, messy, light brown curly wig to mimic Will Ferrell's signature look.
DIY: Style your natural hair with tight curls using a small curling iron and hairspray.
Dale's Frizzy Wig
A voluminous, frizzy, dark brown afro-style curly wig to match John C. Reilly's hair.
DIY: Tease and brush out a tight curly wig to give it a puffy, frizzy texture.
Rather not assemble it? See ready-made Step Brothers costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the light blue button-down dress shirts and button them all the way to the top collar.
- 2
Layer the burgundy argyle sweater vest over one shirt (for Brennan) and the gray argyle vest over the other (for Dale).
- 3
Tuck the dress shirts neatly into the high-waisted khaki pants.
- 4
Secure the khakis with a simple brown leather belt.
- 5
Put on the respective curly wigs, fluffing them up to match the characters' messy, unstyled hair.
- 6
Stand side-by-side with deadpan, slightly proud facial expressions to complete the portrait look.
Makeup & hair
Keep makeup completely natural or nonexistent. For hair, Brennan needs tight, neat light-brown curls, while Dale requires a wilder, frizzy, dark-brown curly style with plenty of volume.
Step Brothers for couples, groups, kids & more
- couples
- One person dresses as Brennan and the other as Dale, or go as Brennan and his therapist love interest, Alice.
- group
- Add a third person dressed in a sleek black suit as Derek, or a parent in preppy clothes.
- kids
- Dress two siblings in matching oversized argyle vests and khakis for an adorable, funny look.
- Plus size
- Argyle sweater vests have plenty of stretch; size up in the button-down shirts for a comfortable, relaxed fit.
- pet
- Dress a bulldog in a mini matching argyle knit sweater vest.
Tips
- Practice your deadpan, unblinking expressions for the perfect photo recreation.
- Wear comfortable, plain brown dress shoes or white sneakers to keep the look authentic.
- Keep a toy drum set or a fake sword nearby as hilarious photo props.
- This costume is warm and comfortable, making it perfect for chilly October outdoor events.
Step Brothers costume FAQ
- What are the exact sweater vest colors for Step Brothers?
- Brennan wears a burgundy/wine red and gray argyle vest, while Dale wears a gray, blue, and yellow/white argyle vest.
- Can I do a solo Step Brothers costume?
- Yes! You can choose either Brennan or Dale, but carrying a prop like a 'Prestige Worldwide' sign or a toy drumstick helps people get the joke instantly.
- What is the easiest DIY version of this costume?
- If you can't find argyle vests, you can wear matching plain white t-shirts with 'Prestige Worldwide' printed or written on the front.
Did you know? The iconic movie poster pose was inspired by actual awkward 1980s family studio portraits, emphasizing the characters' hilarious state of arrested development.