Here's another vote in favor of pinstripes! My suit has pinstripes and I have noticed many applicants wear them also (and here I thought I was being different...)
I wear a Calvin Klein pinstripe suit to my interviews. As long it's a subtle and wouldn't catch an awkward eye, then it'll pass by all eyes. Dress cool, sauve, formal, and conservatively - and that is enough to leave a favorable impression of yourself at the school. The chrome-plated blazer suit and annie glossy red shoes aren't exactly going to make you uniquely stand out positively. if I was an adcom, i'd totally be tempted to make fun of you 😛 .
Macy's had a sale and I needed a suit. Running low on cash since I paid my last installment for my student loan - on the bright side, I'm totally debt free now! Starting saving up for a custom-made Kiton suit 😛. (NOT!)
but damn, some people know how to dress well at interviews - I'm pretty sure I saw someone wearing a Brioni suit at one of my interviews - freakin' crazy!