Some people might say to not wear a black dress for pref because it's very popular for the chapter members to all wear black dresses, so you will blend in. However, your choice of dress shouldn't affect whether you get a bid since chapters don't make cuts after preference (Anyone correct me if I am wrong). If you have a black dress that is flattering and you want to wear, wear it!
Some chapters make cuts after preference.
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Alpha Phi Est.1872
I believe in friendships formed at the spring time of my youth...
Technically everyone is on the bid list somewhere. But with a lot of chapters, they never reach the bottom of the list... so it may feel like being "cut." For instance, if 150 PNMs attend Pref and quota is 50 and the chapter gets the top 50 girls on their bid list, then 100 girls feel like they were "cut" when they were just too low on the list.
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Ain't nothin' finer in the land than a sweet, adorable Delta Gam!