halacha - May my wife wear my jacket to keep warm?

The Sefer HaChinuch #564 writes that it’s forbidden for a woman to wear men’s clothing.

1. 
   

   If it’s cold outside, is a woman allowed to wear a man’s coat to keep warm?

   
   



2. 
   

   If #1 is a problem, are any distinctions made that would allow a woman to wear her husband’s coat while her husband is with her?

   
   

Answer

From Rav Aviner's tshuvot (text)

Wearing Wife's Jacket in the Cold

Q: Is it permissible for a husband to wear his wife's jacket if he is cold, or is it forbidden on account of "Lo Yilbash" (the prohibition of cross-dressing)? And what about visa-versa?

A: It is permissible, since the purpose is not to wear it but simply to warm up (Shut Yabia Omer 6:14).