What size up for M&S slouchy Cashmere?

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If I’m a 14 what size in the v necked cashmere jumpers do I size up to?
I really don’t want to have to order 2 sizes but would like a slouchy look to go with coated skinnies.

Hi - I usually order just one size up for a slouchier look. I've ordered 2 sizes bigger in the past and it's looked a bit too big.