There were a couple of tags, but I cut them off, so I can't say for sure what the fabric is, but I think it's probably polyester... The patterned fabric on the front is more substantial than the black fabric on the back. It's wrinkle-resistant, and the smooth fabric and pattern give it a high-quality look. It's cool, but not see-through like sheer fabric, so your bra won't be visible. I really loved it, but after having a baby, my body shape hasn't gone back to normal, so I can't wear it anymore. I would be very happy if someone who likes it would wear it. ٩(❛ᴗ❛)۶ Approximate flat measurements (laid flat by a non-professional): ⚫︎Width (at armpit seam) 48.5cm - (at hem) 58.5cm The width expands towards the hem. ⚫︎Shoulder width 37cm ⚫︎Front length 64cm ⚫︎Back length 67.5cm Please understand that there may be some error due to the measurements being taken by a non-professional. If you have any other questions, I'll be happy to answer them, so please feel free to comment.