I find BD collars stand up easier with a jacket, any particular tips to help a spread collar stand more proud, I find a more constructed placket helps in that regard
Own your black suit for about the same price as a rental, and wear it to every formal event, fashionable moment, and special occasion that comes your way
For the typical shirt wearer of casual, not formal, dress wearer, the more practical solution for lost buttons would be to obtain and sew on replacement buttons as needed, or to purchase a new shirt
Silk dress shirts are unusual, expensive, and a luxury item
A tucked-in dress shirt always looks more polished, so it's a good look for dressier events