From the BBC:
Before you fear too much for the decorum of old Auntie Beeb, this is what it’s about:
Around 1,000 fans arrived for the Ivory Coast tie in their traditional bright orange trousers – but bearing the logo and name of a Dutch brewery.
To protect the rights of the official beer they were denied entry, so the male fans promptly removed the trousers and watched the game in underpants.
Talk about a strict dress code..
Woe betide any supporters wearing a Boddingtons or a John Smiths T-Shirt during an England game! I remember reading a similar story of a child being suspended from a school in America for wearing a Pepsi T-Shirt on a special day sponsored by Coca Cola.