What is officially confirmed
“99 Problems But A Stitch Aint One” is awarded for achieving 100% quality on a dress. Steam exposes that condition directly.
Use a controlled attempt
Choose a simple design you understand, verify that all pieces and orientations are correct, and make quality the only goal. Changing the design, fabric, cutting layout, and sewing approach at once makes a failed attempt hard to diagnose.
Sew for accuracy before speed
Keep the seam path controlled and slow down before corners or tight curves. If the attempt falls short, repeat the same design and change one part of the process rather than rebuilding everything.
Do not confuse thread colour with quality
Build 410 allows thread colour changes by clicking the spools in the sewing scene. That is a visible customization option; this guide does not claim it changes the hidden quality calculation.
Verification noteAn exact score formula will only be published after controlled in-game testing.