I am an older single girl in shiduchim. Is it permissible for me to buy and wear new clothing during the year of availus for my father?
It really depends on the need, but if there is a need she can buy the clothes and have someone else wear them first, and then she may wear them. If she doesn’t have a choice and there isn’t anyone else to wear them, if the new clothes are needed for a date etc. she may also wear them.
The halachos of not wearing new clothing during the 12 months are similar to not wearing new clothes during the nine days. Orchos Rabeinu 2- pg 13, B’tzel Hachochma 2- 132( 2), Piskei Teshuvos 551-17, Poskim.