Confused about sizing. Need help finding my flight suit size

I’m searching Ebay for a Nomex CWU-27/P flight suit.

I’ve found some sizing charts and I first thoug to be a 40R. But now I find other charts which gives different sizes. I’m a bit confused…

My height is 173 cm (~5’8") and I weight around 73 kg. Normal build. Mostly I wear medium sized clothes.

What do you think? What size should I aim for? Does 40R seem right?

(Theese are some aproximate measurements I tok according to one chart:

Chest: 39 to 40"

Leg inseam: 30 to 31"

Sleeve inseam: 21 to 22")

Thanks.

You sound like a 40R to me.

Thanks! I’ll go for it.