I've been a customer of Abercrombie for a few years now, although I have never once purchased an item for full-price from there (too expensive, in my opinion). I knew that pretty much all of the people that worked there were approached by a former/current employee for having the Abercrombie "look" -- imagine my surprise when on a casual trip to the mall, one of the store managers asked if I wanted a job! For some reason, he and the majority of the store's employees already thought I was employed by Abercrombie, and seemed to find it preposterous that I wasn't.
After sending me over to his assistant manager, I was informed that if I was interested in a position at the store, I needed to fill out an application at the kiosk. The application was pretty simple and generic, you're only allowed to apply for one position which I thought was a bit unfortunate. I originally applied for the 'Model' position (Sales Associate), but after going home and doing some research, decided to go for Part-Time Impact instead. I ended up re-applying online because apparently the two applications were different (which, they definitely weren't). In order to apply online, a store manager is going to have to give you the URL and password to Abercrombie's career site.
You chose your interview date in the last part of the application. At the location I applied to, it seemed like they held interviews every Friday at 4PM. Regardless of position, there is only one interview (group). I would advise arriving early and wearing either their clothes, or clothes that look like their company's. Anything that's been recently purchased from the store is a plus, and try to stick with the colors of the dress code (grey, brown, and navy are big colors; no black or purple).
In all honesty, the people who worked there seemed nice enough. Both managers were extremely amiable and charismatic (I've been there since, and they've recognized and engaged in conversation with me). When I went back for my interview, the model working the front wished me luck and gave me a few interview tips. I realize this all depends on the store, but it seems to me that most of the individuals in the Abercrombie & Fitch, abercrombie, and Hollister in Edison are nice enough.