CAIBI project benchmark: Teagan T-shirt
Prompt version 1.0

Help me build Teagan T-shirt using the existing creator project at https://freesewing.eu/docs/designs/teagan/. This is a CAIBI benchmark adaptation of the project build brief, not a claim about how the creator used AI.

Project context:
- A made-to-measure FreeSewing T-shirt generated from body measurements, then cut and sewn from stretch jersey on an ordinary sewing machine or overlocker.
- Build context: About 1 m / 1.1 yd of suitable stretch knit fabric; Cotton jersey with some elastane is a source-recommended beginner-friendly route; Matching thread; Printed, projected or paperless Teagan pattern generated from the wearer measurements; Optional clear elastic for shoulder reinforcement.
- Where AI helps: Explain measurements and pattern options, Help choose between knit band and binding finishes, Explain stretch percentage and suitable stitch settings, Troubleshoot puckering, wavy seams and neckband fit from observed symptoms, Help plan alterations before recutting fabric.
- Physical work: Measure the wearer, Choose suitable jersey, Generate and transfer the pattern, Cut stretch fabric accurately, Control fabric feed at the machine, Sew neckline, sleeves, side seams and hems, Try on and verify fit.
- Main limitation: Stretch fabric is less forgiving than the small number of pattern pieces suggests. Neckband tension, fabric feed, stitch choice and pressing can visibly change the result, and AI cannot feel whether the knit is being stretched or fed evenly at the machine.

Read the source first. Use its published design, files, dimensions and parts as the baseline; do not redesign it unless a missing detail requires a clearly labelled proposal. If you cannot access a source or verify a revision, say so.

Provide one practical build package:
1. Design and files: explain the source design, link the original editable files, and identify missing files or modifications.
2. Parts and fabrication: give quantities, exact variants and compatibility, plus a cutting or printing list where applicable. Preserve source dimensions; flag anything unconfirmed.
3. UK and US purchasing: direct product links, checked dates, stock, pack sizes, taxes, delivery and regional costs. Mark unverifiable details as unknown; do not invent links, prices or availability.
4. Assembly: an ordered guide covering fabrication, fitting, wiring or software as applicable, setup, checks and troubleshooting.
5. Cost and time: separate parts, fabrication, delivery, hands-on time and machine time, with assumptions and exclusions.
6. Function and ease: a test plan for the project's stated purpose, likely difficulties, required skills and any corrections or limitations.

Keep source facts, your proposals and items needing physical verification distinct. An estimate is not a measured build result. Do not claim to have built or tested hardware. Include failed attempts and omissions. If a section does not apply, say why.

Use the source as accessed during this run and record its revision or access date. The prompt is fixed; the linked source can change.