For a 6yo (girl) and an 8yo (boy) - so unisex if possible - light enough they can wear or carry them themselves, but with a bit of a windcheater factor. Petit Bateau used to do them, but they've outgrown the ones they've got.
Petit Bateau now only do heavy-duty (and heavy) imperméables sort of things.
Millets, Blacks, Snow'n'Rock etc. etc. have thick parkas or pac-a-macs with no lining.
Zara looked promising but light styles only for girls. Assistant rolled her eyes sympathetically when I wondered why all the boys' stuff weighed a ton & had 39 studded pockets.
Where haven't I tried? Help please!