There's certain times in a person's life which call for a shag pile cardigan in a deep plum hue.
Although we're not quite sure what the exact circumstances would be to call for this specific item, when it does come you'd do worse than to have this in your wardrobe.
The comment about not knowing circumstances to wear this was a lie. You should be wearing this as much as you damn well can, because any situation you're bringing this into immediately gets better by virtue of your fluffy cardigan.