Question:
I have shells that I have wanted to add elastic to, to make the neckline tznua without the need for a safety pin. I may have time during the 9 days and want to know if it is permissible to sew elastic into the neckline during this time. Thank you
Answer:
It is permitted during the nine days. Although we don’t sew during the nine days, however small repairs, such as fixing a button, or the hem of a dress etc. are permitted. Adding the elastic would be comparable to fixing a hem.
Sources:
Kaf Hachaim 551-107, Rivivos Efrayim 5-376(11), Orchos Rabeinu 2 pg. 129, Mbais Levi pg. 26, Kovetz Halachos (Bein Hamitzarim) 13-2, Poskim.