Japanese · Pronunciation Guide
sha-tsu, two beats — "sha" is one mora and "tsu" is a single affricate, not "shirts."
shatsu
Two beats, both short. The word came from English "shirts," but Japanese has rebuilt it completely: the r is gone, the cluster has become an affricate, and a vowel has been added — so its rhythm has nothing in common with the source.
Listen: シャツ
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白いシャツを着ています。
Shiroi shatsu o kite imasu.
I'm wearing a white shirt.
Listen: 白いシャツを着ています。
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白いシャツを着ています opens with 白い (shi-ro-i), three morae with a tap and a bare final vowel. So the sentence contains two different sh-type sounds — one before an i, one before an a — plus a tap and an affricate.
Saying the English word "shirts" is the reflex, and it gets almost everything wrong: an r that doesn't exist, a vowel that is too dark, and a final cluster where Japanese has a full mora. Say sha and tsu as two clean beats, with the tongue blade doing the sh and the affricate as one release.