Here’s what consumers have asked with answers from PACSUN staff and previous consumers.
I wouldn't risk it... a lot of people including me experience really slow, bad shipping from pacsun. I ordered 2 bags in the middle of June and they didn't arrive until the beginning of august. I don't know if that was because of the sale they had that day, but from the other bad reviews on this page I can see this happens often no matter what day it is. I'm pretty dissapointed because I ordered a backpack for school last week and still haven't received it yet... next time I'll probbaly order from another company, I've learned from my mistakes.
YES, they are very authentic. They are my favorite store and if you don't want to buy online, you can go instore which is where many people buy their clothes. Although, they are BIT expensive. They are definetely not like Romwe and have actual brands in there shops. I have never not been satisified.