We shouldn't necessarily pay attention to Word's Grammar corrections

Courtesy PixabayIn a draft of a book I'm writing, there's this sentence: 

They were dressed in a variety of ways, one in an expensive suit, another in overalls; one in a track suit and running shoes, another in a jersey and gardening trousers.
A perfectly reasonable sentence for a Kiwi author to write: jersey being the common equivalent of a 'pullover' or a 'sweater.' Which doesn't explain Word's idea that the following are two better and more grammatical alternatives: 
'...some j...