Here's another post of What My Mum Wore. She's a size 18/20 and mid 50s. She wore this on Boxing Day.
Her leggings are the ones you saw previously (her first pair!) from Yours Clothing. Her jumper/tunic combo is from a shop in Bawtry near Doncaster, where she likes shopping as there's quite a lot of upmarket independent shops. There is a separate white shirt and blue jumper here, so they can be worn separately, but when worn together they are joined by a button from the shirt to the jumper.
I really like this piece, I think it's different and looks great on my mum.