I'm pretty keen on non-iron Banana shirts but I wish they had more diversity in their collars. The trick is to know the sizing conventions. They have XS, S, M, L, XL ... XS is only available online and not really worth it as its really really skinny.

Now here's the kicker, each size has 3 sub sizes. Classic, slim and tailored slim. Thats in order of biggest to largest. I have a feeling that the smallest of one size and the largest of the next can be quite close so there's some overlap but the cut isn't 100% the same. Things like the neck and cuffs can differ but because of all the sizes you can pretty much find something fitted to your body without going to a tailor unless you've got a really odd shaped body.

If you're decently fit I would start with the medium tailored slim and small slim.