I applied in-person. The process took 1 week. I interviewed at Gap (Bristol, England) in June 2015
Interview
Got a phone call the next asking basic questions: availability, do I shop at Gap etc. Called me back a few hours later inviting me to an interview in a few days. Interview lasted about an hour, had to answer basic questions about customer service eg. what do I think is the most important thing about customer service. Then had to go around the shop and offer help to customers while the interviewers watched from a distance, this was pretty easy as most people didn't need help anyway. Then had to 'observe the store' look at customer service and things and report back on things I thought were particularly good/ stood out. Final part was to select an outfit for a specific event and person (me for Glastonbury, £70 budget - ask questions about the outfit like budget and things I think that's what they were looking for) so went round store and found the outfit, was under budget by a little bit so they suggested I found an accessory so try to stay pretty close to the budget. Staff were all really friendly and made everything easy and casual. I was their last interview so I got a call later that day saying I got the job, going for a training day in a couple of days.
Group interview with other candidates with the store manager. Arrive at the store and wait for other candidates. Then interview happens in break room and it lasted roughly about 30-60minutes
It was a group interview of about 10-12 people. If I remember correctly they take you to the back, the stock room, and ask almost everyone the same question. The interview lasted about 30 minutes.
It was very easy, one in person interview with the general manager and then I was accepted! Mainly personality and behavioral questions were asked, and I think enthusiasm on my end helped the most.