We weren't allowed all matching. We were told: During round 2, we'll wear khaki slacks with brown sandals and matching brown belts, and a white/bright red/or teal blue polo (You'd be assigned a color). We were told how many pockets our slacks could have, etc.... then during Spirit Week, we would have "Dress Check" where each member would have to model every single wardrobe and accessory for each round for the president, RVP, FRC and Recruitment Advisor (as you know the UCF chapters are huge, so this took a long time in my chapter!). They would tell you if you had to make any last minute changes (down to taking some of the charms off your charm bracelet or getting a new outfit.) We would be shown samples of the general look or color they wanted us to get. This way, all the blue polo shirts were approx the same blue.
I have probably said too much. LOL. We did call our adviser the Rush Nazi.
I kinda liked this-- we were dressed the same, yet different.
It was culture shock when I went on to advise a chapter that bought identical clothing! But it was fun to shop over the summer with my sisters
ETA: It might be more complicated this way, but you also have the option of getting a Ralph Lauren polo, if that's your style, or one at Target, if that's your style.