Amy Poehler in Stella McCartney
Jacket making skills: The Anise sewalong, Gertie's craftsy sewalong. There's also a sewalong for the Clover pants.
Stacy Keibler in Armani Privé
This dress is made with horizontal panels of black velvet with silver piping. I couldn't find a pattern for this (if you know of one, leave it in the comments!) but I think this could be easily done by those with a little patience, experience, and a dress form.
Don't forget to check out this Threads article for sewing with velvet!
Ariel Winter in Valentino
The pattern: Colette Peony dress
The skills: Rhinestone & Telephone sewalong