Hello!
First off, do not worry about going through recruitment as a sophomore - as long as you have a decent GPA (I think the normal is 2.5 and each sorority has their own) then it really does not matter.
Recruitment is 5 days (Spirit, Philantrophy, Sisterhood, Pref, and finally BID DAY!). You go to a certain amount of houses each day, but I am not sure exactly how it works now because I went through recruitment 2 years ago and they changed it last year. I know that you go to all houses (8 to be exact) the first two days, and then after that, I have no idea :/. I know you get to rank after the 2nd day
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Spirit Day is a casual day, so wear something nice, yet comfortable - nice pair of khaki capris with a cute polo, with some "dressy flip flops".
Philantrophy Day is a fun day, you get to make a craft for the local cancer/childrens hospital. I would suggest a cute skirt or white capris, cute top, and a low heel.
Sisterhood Day is more dressy, so a cute sundress would be perfect - definitely with cute heels. A skirt can also work, just make sure it is appropriate for an interview (NOTHING SHORT).
Pref day is more personal usually with one sister. This is definitely a dress day - something that you would wear to a wedding or a cocktail party. Be modest, but cute. Please know that the sororities will be wearing black so you might want to wear a colorful print.
Bid Day - CASUAL like jeans, jean skirt, shirt does not matter because all the sororities have their own shirts that they give to the NMS
you will be spending time with the sorority that gave you a bid so be comfy! Time for pictures, food, and tons of fun!!