3 sentences

1. 我们全班今天都穿了校服。

   wǒ​men quán​bān jīn​tiān dōu chuān le xiào​fú.

   Our entire class wore school uniforms today.

   Source: Dong Chinese Dictionary

2. 所有的学生都必须穿着校服。

   suǒ​yǒu de xué​sheng dōu bì​xū chuān zhe xiào​fú.

   All students are required to wear school uniforms.

   Source: Dong Chinese Dictionary

3. 我没有校服。

   wǒ méi​yǒu xiào​fú.

   I don't have a school uniform.

   Source: OpenSubtitles