Good advice has been already given and I can add little to it. In fact I could have almost said that myself, word for word! But......avoid the Windsor knot. 
An example of a traditional kilted Highland Scot, in Scotland . Details will differ with levels of formality and individual choices, but follow this theme in your mind and you will be not far wrong for the level attire you describe. Although the bonnet and cromach could be put aside for most occasions.
WGN_1530.jpg
You are in your picture as am I, in my picture, wearing lounge/business suit equivalent and is perfectly acceptable attire for any event, day or evening, where you would wear a suit. It can also be worn without a waistcoat and without a tie, but with the jacket quite correctly for less smart events.
Last edited by Jock Scot; 23rd October 20 at 03:56 AM.
" Rules are for the guidance of wise men and the adherence of idle minds and minor tyrants". Field Marshal Lord Slim.
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