Nuno! I thought the exact same thing when I saw her coat.
There's something abut the red suit which is just off IMO. On paper this should be a fantastic outfit. A smart coat with a professional looking suit, what could possibly be wrong about it? IMO it just doesn't work.
Oh, and don't even get me started on the fact she was pretentious enough to bring a cardigan along to change into when she took off her coat. It's the superficial actions like that which sum up Mary's shallow personality perfectly.
If only Mary spent half as much time on her patronages as she does in choosing her outfits.