Have you guys tried Me Undies? Because they make the softest underwear I have ever worn. Bearddamnheroes has been telling me to give them a shot (I think he found them on uncrate), and I finally did and they're wonderful.
I can only vouch for the women's briefs (and indirectly, the men's boxer briefs) - I don't know how comfy the lace is. And the modal fabric appears to be responsibly harvested from wood pulp, so that's a bonus.
You get 20% off for buying from them the first time, and you can get more of a discount if you subscribe for recurring shipments.