Sheikh Saalih received a question that whether a wife is entitled to a daily or monthly allowance and money or a husband is only entitled to fulfill her needs?
Sheikh answered that a husband is obliged to provide accomadation, food, cloth and medical treatment to his wife. There are clear quranic verses and narrations from Prophet (PBUH) asking a husband to provide these basic necessities to his wife.
As for providing your wife with money so that she may use it as she wills is being generous and a husband should be generous to his wife and family because Prophet said:
“If a man spends on his family, seeking reward for that with Allah, then it will be counted as an act of charity on his part.” Bukhari-55
And a husband should think how embarrassing it will be for a wife who cannot even spend on some basic things she want to eat or purchase.