Mishnah Berurah — משנה ברורה

Specifically when it stays [on him] - The later halachic authorities ruled like this "יש אומרים" (literally: "there are those who say" - meaning those with this opposing opinion), even though we established that this other opinion is referring to a case where when he removed his טלית it was without any qualification (ie. he did not have in mind to wear it again)... therefore we say that if his טלית קטן remained on him - he did not remove his thoughts from the מצוה. But if not - then most likely he did remove his thoughts from it. But if he had in mind specifically to return and wear it again immediately, he does not need to go back and make the blessing again when he wears it again immediately... even if he did not remain with his טלית קטן on. And so too the opposite [is true] (ie. if he did not have in mind to wear it again)... that it wouldn't help to have the טלית קטן on... like we said above. And it appears, that if he removed it in the middle of prayers, even without any qualification (to have in mind to wear it again) it's as if he removed it with the intention of wearing it again. And similarly, if he folded it and placed it inside it's pouch, it's as if he removed it with the explicit intent to not wear it again