Froggy Gets Dressed, by Jonathan London, illustrated by Frank Remkiewicz, Penguin Books, 1992.
Of all the Froggy books, this one is my favorite one for beginning readers.
Yes, it is repetitive. That's the point. Once beginning readers hear part of a phrase read, they can work out the rest for themselves, and the next thing they know, they are reading the book by themselves.
So, it is repetitive. It is also very funny.