So ensuring that casual pieces fit correctly is one way to convey smartness
Love this dress on you and the colour is amazing
This dress is stylish and laid-back, featuring linen straps that are lined with lace
I crush the whole peppercorns in a small mortar & pestle so it's fresher and on the coarser side
(Hint: if its not actually stated, its probably fairly casual.) Wearing whatever work-appropriate clothes youre most comfortable in can be a good rule of thumb when no particular dress code is in place again, within reason
A two-piece dress, with its coordinated top and separate skirt, can look polished and elegant as a wedding guest, as long as you read the dress code, choose the right level of coverage, and respect that the day belongs to the couple