Do I have to change out of my winter clothes in the Sydney airport, or can I wait until the hotel?

Here is my usual three layer outfit, (it's FREEZING here). Obviously I can carry my coat, so the question is about my normal clothes. Thanks!
Do I have to change out of my winter clothes in the Sydney airport, or can I wait until the hotel?
Do I have to change out of my winter clothes in the Sydney airport, or can I wait until the hotel?
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