I don't really know what you mean by "a casual city" or "casual for day and evening". I know Pescara more as a port than a resort, but indeed it also has beaches, reminiscent of Rimini with its "stabilimenti" or bathing concessions.
Obviously no holiday resort is going to be as "formal" as, say, Rome or Milan.
If you are talking about clothes - wear whatever you like! What are you worried about? If you want to check out what other visitors are wearing, there are videos on YouTube.
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