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Putting on the Tzitzis in an area where one may not say the blessing?
Initially, one is to wear the Tzitzis in an area where the blessing can be said.  If however a person is in a situation in which he cannot say the blessing [such as in the bathroom or Mikveh, or prior to the time of Tzitzis], then he may wear the Tzitzis without a blessing, and later recite a blessing, as explained in the next Halacha.
 Pashut as one must always say a blessing before the Mitzvah, and so is implied from Admur 18/20 that the allowance is only when one is unable to wear the Tallis in an area that the blessing can be said, and so writes Piskeiy Teshuvos 21 footnote 189
 See cases brought in Admur of next footnote
 Admur 18/7 and 8/20 and 29; Michaber 8/10
 8/20; Michaber 8/10; Rabbeinu Yonah in Sefer Hayirah
 So is implied from Admur ibid and so rules Rabbeinu Yonah ibid; Elya Raba 8/11; Kaf Hachaim 8/40
The reason: If he has water near his bed, he is not to wear the Tallis prior to washing his hands near his bed as one may not touch clothing prior to washing hands.
 So rules Admur in 6/1 and Siddur regarding the blessing of Netilas Yadayim and the same delay would apply to the blessing over Tzitzis.