I’ve just received the costume sketches. I’ll tell you everything I think, without censoring, and you take from my opinion what you like.
I assume that the designer took his impressions from the book and didn’t know, naturally, who would be playing Willy. And I think, for a character in general, they’re lovely sketches.
I don’t think of Willy as an eccentric who holds on to his 1912 Dandy’s Sunday suit and wears it in 1970, but rather as just an eccentric — where there’s no telling what he’ll do or where he ever found his get-up — except that it strangely fits him: Part of this world, part of another. A vain man who knows colors that suit him, yet, with all the oddity, has strangely good taste. Something mysterious, yet undefined.
Read the full letter (which was included in Willy Wonka & the Chocolate Factory (40th Anniversary Collector’s Edition)) at Letters of Note.