Whether K-Pop idols can wear their own clothes depends on the group and their management's policies.
According to available information, it's not always the norm for K-Pop idols to freely choose their attire, and it often falls under the purview of stylists. Blackpink is mentioned as an example of a group with more autonomy in clothing choices. Here's a breakdown:
- Stylist Control: Typically, stylists curate outfits for idols, especially for performances and public appearances.
- Group Exceptions: Some groups have more say in their clothing.
- Blackpink's Case: "[A]s far as I know, the only case of groups choosing their own clothes, is Blackpink. In order to show their individual style, their stylists let them choose from a few options. That's why for most of their performances, they don't have corresponding outfits." (03-May-2021) This indicates Blackpink has stylist-provided options to choose from, allowing them to express their individual style.
Therefore, it is possible, but not always the case, that K-Pop Idols can wear their own clothes.