I only once got stuff from Shein (2 dresses) and they were awful quality. Really not like in a picture, thin and plasticy and with uneven seams so they didn’t hold their shape well. They were very cheap but unwearable. I’m not very fashionable and definitely a snob re clothes, I wear H&M, Next, some Primark, so this was very obviously unwearable.
If you do decide to get it, perhaps leave enough time to get another item in case this one doesn’t work out.