MW parka and matching ski pants in bright flouro orange for sale, £10. Worn for only one holiday, in like new condition. Nice and bright so you can see your kid on the slopes. Waterproof, interior button, lift pockets. Detachable hood. Nice and warm.
In my experience, MW gear runs small. My kids are slight but tall, so they wore MW 9/10 when they were a regular size 7/8.