1930s Corn blue Lingerie set? Help with dating

I recently aquired this beautiful set consisting of a peignoir and matching nightgown. The cut, crêpe fabric and lace inserts say 1930s to me. But it's color is very much different from other sets I've looked up from that age... Plus it has a split in the front of the nightgown/slip, which seems a little risqué and out of style as well. It has no label, but it's an amazing piece. It's my first vintage lingerie set so I haven't seen anything in real life like this before, and I might be totally wrong about the age! Please help?

 

what kind of fabric is it?

 

I think it's silk, and one side of the fabric feels soft and velvety to the touch, almost like a peaches' skin. I might be wrong, and it could be a very fine viscose, but definitely no synthetic fibers like polyester or nylon.

 

Thank you so much! Now you've pointed it out, I see 70s> as well (and will certainly remember the spaghetti strap giveaway)

 

Yea, I think this is 70s.