I've never heard of crotchless briefs where do you get them?
I get mine from Alibaba
That's a wholesale market, right? Are their products good quality? 
Generally they sell cheap crap and it's always a concern about what happens to your payment info
I always try to read reviews before I order from somewhere I'm not familiar with. I looked up Alibaba once and the top two reviews one said ''ITS A SCAM'' and the other one said '' I know its forsure not a scam'' so I just didn't take my chances, hha.
I tried reading reviews but most of them were in Mandarin. There were a couple that read like they were translated by Google during an electrical storm.
That's the worst! At least your experience has been good so far. Shein is like Alibaba I believe have you ever ordered on there? 
I've never heard of it. What country is it in? Do they accept Dogecoins?
I believe it is in China but they ship pretty much anywhere. I received a gift off their website and the quality was definitely cheap but the prices aren't terrible. I have no idea about Dogecoin though. How does Dogecoin work is it like bitcoin?
Yeah, Dogecoin is a little like Bitcoin. What gift did you get from Shein? Was it a packet of those mystery seeds that were arriving everywhere last year?