There is a brand called Womama, another called Freya, and Lovable have a couple of nice maternity sets. I haven't got either but have considered each (just lacked the cash). They're not g-strings. Not sure if they are as generous as you'd (or I'd for that matter!) like, but it's a start.
I have a Triumph mat bra that is very pretty. I don't have matching knickers for it but I love the bra. It is simple and comfy but is pretty colours (sky blue and pink) and has a nice lace pattern. GL!

ETA: Sorry, were any of those "stupid, tryhard names"?!? A bit clueless here...