On my birthday op-shopping trip with my Mum I found three lovely old longline bras. I think Mum paid $1 each for them. I'm not sure what period they're from but they seem quite old. They have metal hardware on them so they must be vintage.
This one's made of cotton rather than stretch fabric.
They're in pretty good condition considering their age but I'll probably only wear the top one because the others seem rather delicate. I've seen lots of reproduction longline bras but they seem to be quite expensive so I'm glad I found some in an op-shop.