The only possible excuse would be if he's recently had foot surgery or something.
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The other chap appears to have made the same decision.
Bear in mind that dear old Arsene, whilst generally managing an excellent impression of a gentleman, is, when all is said and done, a Frenchman. Splendid fellows in many ways of course, but in the area of moral rectitude, sadly lacking.
Indeed so. Consider Herr Klopp. One suspects that the chap considers a tracksuit and trainers suitable wear for training ground, office, leisure time, shopping and visiting the aged ps. The sight of a suit and tie would cause hiom distress and confusion.
That is simply how foreigners are.