Conor McGregor's suit insults Floyd Mayweather

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He's known for outlandish confidence and running his mouth, but Conor McGregor's biggest insult to upcoming opponent Floyd Mayweather was more subtle than usual.

The UFC champion and boxing legend faced off for the first time ahead of the mega fight next month, with both McGregor and Mayweather trading endless verbal barbs.

But the biggest insult from the 28-year-old Irish-born fighter was hidden in plain view of Mayweather, with McGregor wearing a suit complete with pin stripes containing the words 'F**K YOU' throughout the press call.