French designer Philippe Starck has derided Eurostar passengers who dress in comfy clothes for the trip across the channel.
Mr Starck, who is re-designing the train service, said he wanted people to be a bit more stylish.
“There is a tendency today for people to travel wearing purple jogging bottoms, green fluorescent sweaters and orange Nike trainers,” he told the Times newspaper.
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“I can understand that people want to be comfortable, but it is possible to be elegant as well.
“Sometimes you open a little door to people and they will be inspired to upgrade themselves.”