Nothing I said was directed at your personal choices and likewise I do not disparage your choice. If you thought that, then I am sorry for that.
But I thought it bore repeating that there are many good reasons why women wear bras, and some are less obvious than others.
Tell you partner that bras are not the clothing cost issue with daughters, it is the fact that for some reason they can't wear the same dress twice to an important function. If something looks great and fits well, why not wear it twice?
One of my daughters has joined one of those fashion clothes online rental services. It may be the ultimate option for women that are fashion conscious. She gets several very nice trendy items ever month, wears them, and then returns for them other items. Not sure that would work for bras.