Im always perplexed when I read this kind of arguments…
My grandmother was a « petite main », a « couturière-modéliste» whatever and she couldn’t design a dress. She admired the Couturier she was working for even if everything he did was quote on quote « drawing ».
What is required for a designer is to know technical execution. So therefore you shouldn’t design something you won’t know how to execute because if a seamstress or a premiere comes and as about the technicality, you would look quite dumb in front of her.
Even if Azzedine has made it cool to throw rocks at those who don’t sew, despite him admiring Christian Dior (whose famous bar was executed by Pierre Cardin) and executing the Mondian Dress for YSL and pantsuits for Thierry Mugler, a drawer is as much of a technician as a sewer.
Much like shoe designers are not necessarily shoemakers. Salvatore Ferragamo was a shoemaker at heart. Roger Vivier was a designer and wasn’t in the factory executing shoes. But both designers are legends in their fields because they knew everything about the making of a shoe.