Getting Dressed on Shabbat
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- It's permissible to spray deodorant on one's body (including hair) but not on one's clothing on Shabbat. If one first sprayed deodorant on one's body it's permissible to put on a new shirt even though the deodorant will absorbed with the shirt as long as one doesn't have any particular interest about the smell in one's shirt.  One may also apply a pleasant fragrance to one's hair. 
- One may not use stick deodorant on Shabbat. 
- One may look in a mirror on Shabbat if the edges of the mirror aren’t sharp enough to cut one's hair. 
- If a shoelace came out of the shoe on Shabbat one may thread it back through the laces. If the shoelace was never threaded into the laces one should not do so on Shabbat unless the lace is a strange different color to the extent that it's certain that it will be removed from the shoe later or if one does so in an abnormal way like lacing it through the top laces and it's certain that one will fix it later. This is all assuming that it's easy to lace the string through the holes. 
- For the halachot of tying the shoelaces see Koshair.
Hand Warmers on Shabbat
- It is problematic to use a hand warmer on Shabbat.
- Shulchan Aruch 303:27 forbids combing one’s hair on Shabbat since it’s inevitable that one will remove hair.
- Shulchan Aruch 303:26
- Sh"t Yechave Daat 1:31, Yalkut Yosef (Shabbat vol 4 pg 79 and 406, Kitzur Shulchan Aruch 327:7), 39 Melachos (Rabbi Ribiat, vol 2, pg 479), Rav Moshe Feinstein (cited in sefer Hilchos Shabbos by R' Shimon Eider-Melocho of Dosh-notes 219) and the Chacham Zvi 92 also write that one may only spray it on one's skin and not one's clothes based on the gemara in Beitza 23a which says that this is a problem of "molid reicha," creating a new fragrance in clothing.
- Ben Ish Chai in Sh"t Rav Pealim OC 2:51 is strict even to use deodorant directly on your body in accordance with the Taz and Magen Avraham in Siman 511 but see Sh"t Yechave Daat 1:31 who deals with this by saying that the Rambam, Rif and Rosh would even be lenient to put it onto clothes and therefore we can certainly be lenient for putting it in the body
- Yalkut Yosef (Shabbat vol 4 pg 79 and 406, Kitzur Shulchan Aruch 327:7).
- Yechave Daat 1:31
- 39 Melachos (Rabbi Ribiat), vol 2, pg 479
- S”A 302:13, Mishna Brurah 302:63. See also Mishna Brurah 302:64 who references the halachas of Beged Isha, while Yalkut Yosef (Shabbat vol 2, pg 90) writes that our minhag is to be lenient on that issue.
- Shemirat Shabbat KeHilchata 15:64
- Yeshurun v. 21 by Rabbi Menasheh Shimon describes the issues with using a hand warmer on Shabbat. 1) Bishul. It isn't bishul since it doesn't reach a temperature of Yad Soledet Bo. 2) Makeh Bpatish. By squeezing it the hand warmer is completed. Perhaps that doesn't apply since one only exposes it to oxygen which causes it to heat up and Makeh Bpatish can't be violated indirectly. 3) Molid. Changing the form of an item is molid. However, it is a dispute in many cases such as making ice, crushing ice, making seltzer, and using whipped cream. Rabbi Shimon concludes that it is permitted only in cases of great need. Rav Zalman Nechemya Goldberg said that it is preferable to use the hand warmers in an abnormal way. Rabbi Aryeh Lebowitz quoted Rabbi Rice who quoted Rav Schachter that ruled it was forbidden because of Molid. He also cited Rabbi Mordechai Eliyahu who said it was molid.