1. Roman
2. I think similar like Westerners
Like this shown by our potential President candidates 2024
3. It depends, Malay Ethnic like Sumatra, Kalimantan, Sulawesi have different dress but in general they cover whole body but hijab is very rare while Javanese middle and upper class also the same but different style, Javanese lower economic class from what I see on photo has more open dress that shows their hand and shoulder
Javanese dress, old photo
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4. For men I think prior to 1950 they have followed Western dress for work or formal thing
Agus Salim old (Politician / Independence Movement)/West Sumatran (Minang ethnic / it is part of Malay)
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Agus Salim young
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While most folk in West Sumatra wear this
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5. My country is not an Islamic country (actually prophet Muhammad never said Madinah as Islamic State either), but Islam does influence the nation