Shirting advice for ungodly heat

[pugnax]

I have a wedding coming up in a few months (not my own, alas) in the south of France, where I fear the weather will be the kind of hot that drives horses mad. I have a tropical wool suit (in navy) and a linen suit (tobacco brown), I haven't decided which I'm going to wear yet, as I'm mostly concerned about the shirting -- specifically, what sort of fabric will help stop me being reduced to a puddle of sweat?

It'll be a moderately casual vibe, and stupidly hot, so I'm not bothering with a tie: what kind of shirt would you guys recommend? Maybe seersucker? Or more linen? Is it a faux pas, or even desirable, to wear a linen shirt with a linen suit?

Advice, as ever, gratefully received.

 

[Bonbon_style]

i think linen on linen is very nice i mean back in the day all shirts were linen.

 

[Hₑighthere]

I recently bought a Giro Inglese shirt (an open weave with a honeycomb appearance), and it seems promising, but I haven't had a chance to try it out in any properly hot weather yet.

For a 'moderately casual' event a light piqué knit might also be viable.

 

[Duke Santos]

Sunspel Riviera fabric comes in long sleeve polos and full button ups.

https://www.sunspel.com/products/mens-riviera-shirt-in-white-msht2072-whaa

 

[The Noble Dandy]

Well, if it's July in France, then no shirt will help But I would probably go with the linen shirt. And it's not a faux pas to wear linen on linen. On the contrary - this would create a nice, hot summer-themed ensemble.