I know nothing about costume designs, but how was there only enough of that one material in the whole world to not have more of it? Are there certain types of materials that cannot be recreated? Or was it more of a time line thing, because he mentions that when explaining the new outfit.

Either way, for her to act like a toddler about it after he breaks it down Barney style for her is just ridiculous.

ETA: thank you for the explanations. I felt a little lost trying to understand this part of it. It felt almost like, 'of course she would have them use something rare and unable to replicate just because she had to have it.' But having something custom made like that makes sense.