Does anyone really know where the clothes are made?

I have a question. It seems that there is a lot of information shared here about inexpensive jersey sellers. But even if the sellers are different, aren't they all sourced from the same factories in Thailand or China? Does anyone really know where the clothes are made?

Chinese sellers are cheaper than European sellers, and it seems that even they source their products from Thailand.

It's hard to imagine how cheap they actually are.