The man is responsible for all the preparations for the wedding, including the bride's dowry. Although the clothes worn by parents are not expensive, it is not a big problem for the man to be responsible. It is also possible for the two companies to negotiate in advance.
As long as the clothes worn by married parents are decent and generous, there are no certain rules and requirements. Just wear it as usual, no matter how you wear it, it looks good, unlike the clothes worn by the bride and groom must be mainly suits and cheongsam.