Halloween without the hassle
My Kid Just Told Me They Need a Costume Tomorrow
Of course they did.
The Fastest Answer
Do not choose a costume first. Start with the child's clothes and build backwards.
The Reverse-Costume Method
Look for useful basics: black or white clothes, sportswear, pajamas, overalls, a hoodie, a dress, a jacket, hats or anything unusually distinctive.
Then ask: What recognizable idea could these clothes already support?
Recognizable Beats Original
For a last-minute costume, an idea that reads quickly is usually more useful than something elaborate that needs six missing pieces.
The $0 Version First
Try to finish the costume with things already at home before shopping. If that works, stop.
Find One Missing Piece
If the clothes create a clear base, identify one item that would make the idea easier to understand. Do not quietly turn one missing piece into an entire costume rebuild.
If You Buy Something
Check the retailer or manufacturer's current age guidance, sizing, included components, warnings, instructions, availability and pickup or delivery information. Product-specific guidance should come from the current source, not from a general article.
The Short Version
Start with the child's closet. Build backwards. Find one missing piece if you need it. Do not panic-buy an entire project.