Unbuttoned collar and loosened knit tie?

Howdy,
For an informal setting, with no preferred dressed code, what would you complement with a blue check dress shirt worn with the collar unbuttoned, and a blue knit tie?

I am debating whether a combo of sweater, chinos and dress shoes would be ok. I don’t own many sports jackets, and I’d rather avoid them.
What would you choose, and in which color?
Can’t wait to hear from you.
Thanks.

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