I have noticed this on quite a few sites now and don't think they realise they could get into trouble.When selling ex store products you have to detag them, and you are not allowed to actually state where they are from!!
I made the same mistakes iat first but quickly fixed them. If marks and spensers etc caught you they could do something about it!You can mention form a major high street store buyt you shouldn't mention which. they must be detagged so customers don't try to take them back for a refund!

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Childrens Fancy Dress Costumes and Party Dresses
Childrens Costumes and Dancewear