Armed Forces Uniforms Act Article 3

Wearing Dress Uniforms on the following occasions:Subparagraph 1a formal visit to the President or Head of State of our Allies;Subparagraph 2attending a grand ceremony or banquet of our own or foreign countries’;Subparagraph 3a formal visit or a repaying visit to officials and officers of our Allies;Subparagraph 4attending important ceremonies or other formal occasions;Subparagraph 5ordinary working days or outing.
中文原文 陸海空軍服制條例第3條
現役軍人穿著軍常服之時機如下:
一、晉謁總統或友邦元首。
二、參加本國或外國大典或宴、酒會。
三、正式訪問或回訪友邦文武官員。
四、參加重要典禮或出席其他正式場合。
五、平時辦公或外出。

English translation for reference only; the Chinese text prevails. Not legal advice.