What kind of pen was used to write on clothes?

Writing on clothes usually required a professional drawing pen or a signature pen. Professional drawing pens usually had rich colors and thicker tips, which could better draw patterns and words on clothes. The signature pen was more suitable for writing personal information such as names and dates on clothes. However, it was important to note that when writing on clothes, one needed to avoid using overly bright colors or pens that were too thin to avoid making the clothes look too abrupt or awkward.