For an evening invitation, start with the dress code and one piece you want to wear. Sandro Qatar's Evening edit provides a way to consider that direction without treating every occasion as the same. A dress creates a single starting silhouette, while separates allow you to adjust the balance one piece at a time. Keep the setting in mind as you choose.
A formal menswear selection offers a more focused route when a defined outfit is appropriate. Whichever approach you take, let the main piece lead before introducing additional details, and check the individual listings for the styles currently available in the edit.