Well that's weird. Considering I purchased it new it doesn't have any tags nor does it show signs or being torn off both the dress and underwear. I'm not good with fabric names so please bear with me. The mint color feels silky like a nice nighty. I have no idea how to explain the feel or texture of the metallic color. It is different then the dress make a crunchy noise when you grab it and isn't as soft and silky. I'm so sorry this answer sucks. I wish it had some sort of tag so I could cheat and give you a perfect answer. How frustrating. My husband amazingly is better at that stuff then me. When he gets home from work I can see what he guesses it is or can come up with a better way to discribe the material.
My husband said the mint color is a silky like material. But definitely not silk. As far a as the metallic he said he had no idea what it is or how to explain it. Sorry :(
I was just wondering because I plan on wearing this to my mothers wedding if I can win it and it was going to be on the beach and I just dont want to be freezing my caboose off LOL!