Jewish men tend to dress the same, at least within their groups. So at a yeshivishe wedding, the chances of sitting next to a man (or a tableful of men) wearing the same suit, tie, hat, glasses, socks, shoes, and cufflinks are millions of times greater than the chances of sitting next to a man or men wearing noticeably different garb.
Women, however, while they want to wear ALMOST the same dress as their friends/neighbors/children do not want to wear the EXACT same dress because then they are afraid others will compare them and think the other woman looks better in it, or they will find out they paid full price while the other woman got it 75% off.