As a wedding officiant / minister please allow me to answer your questions.
Second-time and repeat brides should wear whatever they want!
Anyone dear to the bride's heart can give her away.
There are no guidelines for weddings as long as couples sincerely love one another, desire the blessing of God, and are committed to a lifelong loving relationship.
The biggest misconceptions about marrying at this stage is all the dos and don'ts. The Creator loves humanity unconditionally and wants them to manifest authenticity and creativity when designing their intimate wedding ceremony.
Be true to yourself, prepare a delightful wedding ceremony you like, and have no regrets thereafter.
Paul F Davis - Wedding Minister, Love Coach, and author of Are You Ready For True Love? and Almighty Matchmaker