How exactly should one go about fulfilling the mitzvah of buying your wife clothing for Yuntif? Nowadays, women always buy their own clothing. And often, the husband and wife share one bank account which the both contribute towards. What should the husband do to fulfill his mitzvah?
There is no fixed amount that is required to fulfil this mitzvah. If the husband contributes half of the costs and thus enables his wife to buy the clothes, presumably he has fufilled this mitzvah.
The mitzvah of buying clothes for one’s wife for Yom Tov is part of the general mitzvah of ensuring that she has Simchas Yom Tov. If this can be achieved in other ways he has also fulfilled the Mitzvah.