You Can't Milk a Dancing Cow by Tom Dunsmuir, illustrated by Brian T. Jones

From chapters.ca:
Poor farmer Picket! Since Mrs. Picket made the cows raincoats and galoshes with her new sewing machine, they won't come into the barn to be milked. Children will love Mrs. Picket's solution for these and other dilemmas Farmer Picket faces when his wife begins creating animal fashion.