About as Casual as you can get!

[David White]

Mr. White,
you look quite mellow, don't mess it up with anymore work.

slick

I won't trust me. Yes, I'm a very mellow guy, and yes the SUN was in my eyes. And the person behind the camera was my 9 year old, kinda' caught off guard

[Arlen]

Looking good.
Glad you got everything all fixed up.

[Dirk Skene]

That is about as casual as a man can get

[GMan]

You have the comfort thing down well. Good for you.

[Graham]

That's not casual!! get your shoes off and feel the earth, not THAT'S casual

I love casual, I sometimes get comments like "now that's back to basics", I live in a casual place.
Personally, I'd tuck the vest/singlet in (loosely).

You look comfortable, that's all that matters.