What is Daisy telling us about Gatsby when she mentions never seeing such beautiful shirts before? (It has something to do with her husband, Tom)

Upon seeing the shirts, Daisy cries and explains, "It makes me sad because I've never seen such-such beautiful shirts before."

One reason for Daisy's reaction could be that she only cares about material goods, and so something like fine clothing can make her feel affection for Gatsby.

However, the shirts more likely symbolize how far Gatsby has risen since she last knew him, and she may feel emotional that she doesn't have the chance to marry him now.