I haven't seen the Royal Collection fabrics. Can you tell me more about them?
I'll try. The shirts from the "Royal Collection" routinely break $500 and approach $650. I had an opportunity to try on a 15 at the Borrelli sample sale that was held earlier this year. The fit still remains generous for the American market even with the more premium shirtings.
As far as fabrics are concerned, they are nice, probably 140s or better. Small patterns within the traditional color spectrum (white, blue, yellow, pink, etc.) are their strength. Are they worth the extra premium? That decision is left to the individual. Personally, I felt that Kabbaz selection of 140s and 160s from Acorn were markedly better. Again, if you live in an area with a respected shirtmaker, I personally believe that MTM and bespoke is far better in terms of value.