My dear Sr Diaz: not at all, really, although shape-wise they are not ideal yet - that tailor is never to be seen again (by me, I mean, I haven't actually murdered him), and I'm engaged in a crash health kick this summer so they will gradually be getting looser around the chest and waist! (Well, that's the idea...) I'd never noticed that about the arms, perhaps because it's a soft linen and wears very easy. I see what you mean. Until I can go order another batch of suits from my new tailor, I'll just put it down to manly physique.
Good spot on the CT shirt. The collars do vary between styles; I bought a batch of them a few months ago for under 20 Euros a piece. I find them quite comfortable, but some of the collars are definitely just a few millimetres shorter than I'd like - this is one of them.
Thanks for your thoughtful input. You are a good man.