Cats...in Opera, it doesn't matter. Jessye Norman was in Verdi's Aida, and she is a fat black woman. (Okay, I don't actually know if Jessye was in it or not, but she could have been)
Height is important in the proffesional world. On Broadway, in Les Miserables, they ask for their males to be 5'9", and in Will Rogers Follies, all of the girls had to be about 6'. But, in some shows, it depends on the casting director. In most shows, If you cast a tall lead female, you're gonna need to cast a male who is taller than that female. That's what they do in Callbacks - measure up cast members - see who looks good next to whom. Looks also play apart in that factor - along with chemistry. There's a lot in this business of height, looks, chemistry, etc. People don't get cast because they are not talented, but because of all the other requirements involved.
"Do you know what pledge time is, Andrew"? said the PBS Executive.
"Yes", Lloyd Webber replied. "My 50th birthday special must be one program that gets done a lot."
"No", mused the man from PBS heedlessy. "Not so much. Our Stephen Sondheim Carnegie Hall concert. That's a big one."
Spoons, forks and knives seemed suddenly to suspend their motion in horror, all around the table.