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Oliver Peoples Victory.
In the pilot it's established that Fiona is Irish and as such she speaks with an Irish accent. In the second episode she greets Michael using an American accent. When he asks her about it she says she "can't go around Miami sounding like a freaking leprechaun". So Fiona is still Irish, this was not retconned after the pilot, she merely chooses to speak with an American accent in order to blend in.
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