I went through a major My Fair Lady phase when I was in high school. My dad bought me the box set for Christmas (back when Laser Disc was all the rage) and it came with a portfolio of these sketches inside.
They're prints of Cecil Beaton's own sketches... the ƒahbulous Cecil who easily seduced an Oscar for this film.
The Laser Disc box set also came with a VHS (yeah, I don't get it either) of a special making of documentary that was shot and shown on tv when the film was released. I'm sure it's on a DVD somewhere. If you can find it and you're a costume nut like me, you will not be disappointed. It shows exclusive footage of the whole wardrobe department; it even features the 'Glove Girl' whose job it was to give all the men and women their gloves for each day and ensure their arrival back in the department at the end of shooting.... I don't know why I delight so in little unknown snippets such as 'Glove Girls'.
I can't find anything on YouTube, but one of these days I'm gonna figure out how to upload VHS footage... yes one of these days.