Souma is really susceptible to cracking up, and even memories will put him into laughing fits. But being self-conscious about this, he always tries to hide it. When he does this again at a clothing store his friend works at, the friend asks him why he does that, especially when it's so easy to tell anyway. Later, Shun also repeats the same sentiment...
Oh, he was talking about clothing sizes.
Ach, es geht um Kleidergrößen!
Und warum auch immer hab ich verloren.
¿Estábamos hablando de ropa?
¿Y en qué perdí?
¿Estábamos hablando de ropa?
¿Y en qué salgo perdiendo?
C’était pas un délire sado-maso…
Et en quoi j’ai perdu ?
Quindi parlavamo di taglie?
А, так речь была об одежде?