Fiona arrives with 9 commissions, and every one of them has its own page with the brief and a validated dress. The line opens with “Best Baker”. The requirement her briefs lean on most is Cute, Playful, Patterned.
Friendship with her runs to 5 levels and hands over 12 patterns along the way, across the parts of a dress — bodices, skirts, sleeves and collars. The unlock list above is the whole ladder: what each level gives, and what is still ahead of you.
Her Friendship level is only shown if you set it yourself. The game does not publish the points a commission awards, and the delivered briefs alone cannot tell you where you stand.
This page lists her whole line, including commissions that arrive late in the story, and names the patterns a high Friendship level hands over.