Where can I find this outfit and mask?

Altar_boy

https://www.daz3d.com/gallery/#images/570636/

Seven193

Click on the user's name and search their gallery, looking for comments.

Here's one comment:
https://www.daz3d.com/super-bodysuit-for-genesis-3-female-s
https://www.daz3d.com/supersuit-pro-bundle

Whatever he used, he must have re-textured the bodysuit with his own polkadot texture.  I don't think you'll find it anywhere.

pwiecek

Dave230 said:

Whatever he used, he must have re-textured the bodysuit with his own polkadot texture.

And did an excellent job avoiding the seams

Seven193

pwiecek said:

And did an excellent job avoiding the seams

There are dots by the ankle and foot which are half-cropped, so I think he just slapped on a polkadot texture, without much effort.

Just overlay a polkadot pattern over the UV map, and you're done in most cases.  If the UV map is symmetrical and even, then that should work even better with overlay patterns.