I've worn this often as a favorite, but there are no noticeable stains! There's no size listed, so it's hard to say, but I think it would be cute on a 4-5 year old. I bought it as a 4y! I think it's about 100cm! You can wear it now with long sleeves, or just one layer until almost summer ♡ It's light and useful ♡ Please understand that this is a used item!