Build a Halloween costume within your budget
A materials-first costume plan with missing prices clearly marked. Paste this prompt into ChatGPT, Gemini, Claude or Grok, change the parts in brackets to suit you, and generate.
- Written for
- ChatGPT, Gemini, Claude, Grok
- Occasion
- Halloween · 31 Oct
- Status
- Tested 9 Oct 2026 in Grok, 9 Oct 2026 (one run; model id not exposed)
- Test settings
- The page's exact default prompt was run once in Grok on 9 Oct 2026. The default details already written on the page were the input. They are illustrative, not a record of a real event. ChatGPT and Gemini were not used. The first result was kept.
- Variability
- A different set of details, or another run, will change the wording. This is the first result for the defaults on this page.
Prompt
Plan a DIY Halloween costume that I can realistically make. Concept: an original midnight botanist Budget and currency: 40 CAD Already owned: black jacket, boots, fabric leaves Skills and preparation time: basic hand sewing; two evenings Use only the details I supply. Ask for essential missing information rather than inventing it. Label suggestions as ideas, not facts or confirmed bookings. Do not invent prices, people, schedules or offers. Give a parts list: item | reuse/buy | purpose | supplied price or ?. Divide essential pieces from optional decoration. List assembly steps in dependency order and estimate time, labelling estimates. If the known prices exceed the budget, simplify the costume. End with fit/movement checks and three questions about unknown costs. Avoid working weapons, flames and instructions requiring specialist machinery. Budget check: treat unknown purchase prices as unknown, never as zero. Show the known subtotal and unresolved purchases separately; do not say the costume is within budget until every essential purchase has a supplied price. If no prices are supplied, prioritise reuse and ask for quotes before giving a purchase recommendation.
Customise
For example: an original midnight botanist.
For example: 40 CAD.
For example: black jacket, boots, fabric leaves.
For example: basic hand sewing; two evenings.
Fields start with illustrative values; replace them with your own facts. The prompt updates as you type. Copy prompt copies your version.
Example output
Actual tested output. The notes used for this result are an example, not a real event. This box is not copied. Replace the notes above with your own before you paste the prompt.
Reuse-only midnight botanist. Ideas for assembly, not a booking and not a shop quote. Parts item | reuse/buy | purpose | supplied price or ? Black jacket | reuse | main body of the costume | owned; no purchase price supplied Boots | reuse | footwear | owned; no purchase price supplied Fabric leaves | reuse | botanical detail on the jacket | owned; no purchase price supplied Needle and thread | buy only if you do not already own them | hand sewing | ? Extra leaves, trim, or a bought flower | optional buy | decoration beyond the leaves you have | ? Essential pieces: black jacket, boots, and the fabric leaves you already own. Needle and thread are essential only if they are not already in the house. Their price is unknown, so they are not counted as free. Optional decoration: any extra leaves, trim, or flower. Not needed for the costume to read. Budget check Known priced-purchase subtotal: no purchase price was supplied. Unknown prices are not treated as 0 CAD. Unresolved purchases: needle and thread if you need them (?); any optional decoration (?). Spending cap noted: 40 CAD. The costume is not called within budget. A reuse-only build has no essential purchase if needle and thread are already owned. That is not the same as a priced proof against 40 CAD. Ask for quotes before any purchase recommendation. Assembly, in dependency order. Times are estimates, not a trial. 1. Put the jacket on with the boots. Estimate: 10 minutes. Stop and adjust before any sewing. 2. Take the jacket off. Lay the fabric leaves on the outside. Estimate: 20 minutes. Depends on step 1. 3. Pin or baste the leaves where they will not block the jacket closing. Estimate: 20 minutes. Depends on step 2. 4. Hand-sew the leaves with wide stitches. Estimate: 70 minutes. Depends on step 3. Basic hand sewing only. No machine. 5. On the second evening, check the stitches and do the movement test below. Estimate: 30 minutes. Depends on step 4. Estimated total: about 150 minutes across the two evenings you have. If you have no needle, stop before step 4 and do not buy until you have a CAD quote. Fit and movement checks Close the jacket the way you will wear it. Sit, stand, and walk in the boots. Raise both arms. Confirm leaves do not cover eyes or mouth, catch the boots, or stop the jacket closing. No flames and no working weapons. Questions about unknown costs 1. If you need a needle and thread, what is the quote in CAD? 2. Do you need any material beyond the owned jacket, boots, and fabric leaves, and what is that CAD price? 3. Is there a travel or delivery cost to get it, and what is that amount in CAD?
How to use it
- Open ChatGPT, Gemini, Grok or Claude.
- Paste the prompt and replace the [BRACKETS] with your details.
- Review names, facts and the requested format; follow up with corrections or missing details.
How to use this prompt
- Fill Customise with your real details. Do not let the tool guess a missing fact. Write the missing information clearly if you need to.
- Press Copy prompt and paste it into the AI app named above. This page copies the prompt. The answer is created in the external app.
- Check names, facts, numbers, language and the format you asked for. If something is wrong or incomplete, ask for a correction.
Good to know
- Prices are not live quotes. Check materials, fit and instructions yourself; this is a concept plan, not a certified pattern. Run once in Grok on 9 Oct 2026 using the illustrative defaults on this page. Check the draft against your own facts before you use it.
- Check facts before you rely on the answer.
