Although you can wear T-shirts for weddings in Hong Kong, it is recommended that men wear trousers and leather shoes, while women can wear skirts or trousers with shoes or sandals. It is more appropriate to dress like this, and it can show respect and attention to the wedding.

Of course, if there is no special dress code for the wedding, then casual clothes are ok. However, please note that wearing clothes that are too casual or too revealing may be considered impolite or inappropriate. Therefore, when attending a wedding, it is best to know the dress requirements of the wedding in advance and choose the appropriate clothes.