A selection of headlines from stories in the news. They use English in a way that you might think is intended to confuse but it's all perfectly clear to the native speaker.
The full headline in this story in the Metro is "Now four-year-olds are wearing their grad rags". It appears on a story that children in nurseries are attending "graduation" ceremonies prior to going to primary school, complete with mortar and gown it sounds like a nice money spinner for someone.
The use of "grad", short for "graduation", "rags" is a play on the term "glad rags", which is a term used to describe your best clothes, or clothes for a special occasion.