long sleeve spring dress Magically Charming Mini | Made-To-Order shoulder neckline that gracefully reveals the collarbones Calypso Long Sleeve Maxi Dress

But you can find tutorials online everywhere for a basic circle skirt

Otherwise it appears to me that someone is trying too hard and attention seeking ( red carpets are a good example) , inconspicuous is I would suggest best

Colour: We looked for dresses that were deemed respectable - no cut-out dresses or backless dresses in this edit

By not looking professionally worked on, you're more likely to blend in as a guest.

For a semi-formal night time event, a dark suit or a tuxedo which isnt as formal as that which you would wear for a black tie event is most appropriate

White should be avoided by guests at any ceremony where the bride is wearing white, as it is considered the brides colour