noun
no dress code; free dress
Used in workplace, school, or event contexts to indicate that there is no prescribed attire; often seen in job postings or event descriptions.
この会社は服装自由なので、私服で通勤しています。
This company has no dress code, so I commute in casual clothes.
パーティーの案内に「服装自由」と書いてあった。
The party invitation said 'dress code: free'.
Compound of 服装 (attire) and 自由 (freedom), literally 'clothing freedom'.