A marking pen including a body including a pen and a cap. The cap includes a clip including a first leg that extends from the cap body and away from the cap body in a first direction that is along a transverse axis of the cap body, a second leg that extends from the first leg and away from the first leg in a second direction to create a gap between the second leg and the cap body, and a third leg that extends from the second leg in a third direction along a longitudinal axis of the cap body and the third leg also extends toward the cap body along the transverse axis of the cap body. The clip is configured to attach the cap to an article of clothing in the gap between the second leg and the cap body.