Four feathers, not twenty
The Phoenix Costume screenshot resolves the accessory minimum: Feather 20/4 means twenty are currently placed against a requirement of at least four. The walkthrough's informal “a couple” is not a reason to stop at two.
A sequin corset-skirt route
Start with a cinched keyhole blouse or corset bodice, bell sleeves and corset skirt. The walkthrough recommends sequins for Glamour and Risqué, and notes that silk can also work. Compare the actual fabric tags with your draft before selecting an alternative.
The source does not make the screenshot's red-and-gold appearance a compulsory colour list. Nor does choosing sequins create Art Appreciator's separate Sequin-percentage requirement. Follow the named rows on the Phoenix card instead of importing rules from another costume.
Counts and placement are different checks
Place feather accessories on the sewn dress until the Feather row reaches four or more. Inventory stock does not count as attached decoration. Check the row again if you remove or replace a feather while arranging the costume.
The example uses many feathers to build its silhouette; that is a design choice beyond the minimum. Inspect the front and side views for buried or overlapping pieces. A passing count does not guarantee attractive placement, and copying this arrangement is not a universal clipping fix.
Before finishing
Read Feather at least 4, Glamour at least 60, Risqué at least 30 and Quality at least 80 on your current order. If feathers pass but a style row is short, fix the fabric or pattern gap. If only Quality is short, review measuring, grain and sewing.
Finish the dress and use Complete Commission once it is ready. Green rows on a Finish Dress screen are making-stage evidence, not proof that the customer accepted or paid for it.