Be patient, it will blend
When visiting the Vatican, you have to think of it like a very exclusive club : to be sure to get in, you need to be dressed right
"Options include off-the-shoulder, cap sleeves, illusion sleeves and detachable sleeves, allowing for customization to suit the bride's preferences." It's important to note that certain kinds of sleeves, such as full set-in sleeves, will be difficult to execute without adding additional build up to the dress, so in those cases a slip-on elastic style will work best, as Giresi shared
According to this MasterClass article, smart casual attire can include well-fitting, polished business wear with elements of casual attirethink blouses, polo shirts, button-downs, chinos, dress pants, dark-wash jeans, and polished, practical footwear. On the spectrum of formality, smart casual exists between dressy casual and business casual