If I take off my Tallis to go to the bathroom, do I make another Bracha when I put it back on?

It depends: if you are wearing a talis kotton and you put back on the Tallis within a few hours (even if you have not intended to do so when removing it), you should not make a bracha.

However, if for whatever reason you are not wearing a tallis kotton and you did not have the intention to put the Tallis back on, or you had the intention to put it back on after a few hours, you make a new bracha.

Regardless, if a few hours have passed, a new bracha is recited.

עפ”י פסקי הסידור. והערנו מזה כאן (ס”ג).

בהפסק כמה שעות – ראה כאן:

When one goes to eat at a friend or in-laws Shabbos day, and takes off the Tallis for the meal, may he put the Tallis back on and wear it in order to get it back home? Does it matter if it is cold outside? 

Regarding Tefillin – see here:

If I take off my Tefillin to go to the bathroom, do I make another Bracha when I put it back on?

Source:

Alter Rebbe’s Shulchan Aruch 8:23-25.

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