運動服 的英文怎麼說?

[1] workout clothes[2] athletic clothes[3] gym clothes[4] activewear
  sportswear

gym clothes = 特別指去健身房穿的衣服

activewear 跟 sportswear 通常是服裝店會用的詞，但對話時不會使用，例如我可能會說:

Let me change into my workout clothes.

卻不會說:

Let me change into my activewear.

但在服裝店，我可能會看到以下:

Nike Sportswear
Women's Activewear

sports clothes 老外也聽的懂，卻不是很正確的說法。