Smart casual demands a work shirt, polo is absolutely out IMHO

in Malaysian boundaries is no sexy
batik is widely acceptable anyone stop u because wear batik u can viral it on internet , sure authorities will stand at ur side

yes that's good TS

Smart casual means sporty-looking business wear, ie shirt and pants that looks office-like but more showy than normally acceptable in an office. In Msia where people don't normally wear coats/jackets because of the weather, wearing a coat is definitely on the more formal side.

A non-black blazer or sport jacket is more fashionable than business, but if you know any other attendees you should ask around what they are wearing.

Yours is wedding kah? I'm also attending a hotel wedding this weekend. The family requested jackets but since I am distant and junior, I'm playing with no tie. Considering going like this, but with black dress shoes and belt: