I'm wearing it right now, and the guys small is a little snug around my chest, but still good.

However, I'm wondering about the irregularity in the pattern on the back of this shirt. There is an isolated light colored shape below the horse's neck. Is there any significance to this as part of the design? I really don't see any reason for this pattern abnormality, and am wondering if it was unintentional.

Also, on the tag, it says On the Plains We gave Him Hell.
Who is him? I thought it was them.