Christening - godmother role

[MrsPear]

I need ideas please. What is considered appropriate clothes wise for a Church of England christening as a godmother role? As asked by little sister. She is 30, a pear and 5’2” with short legs. I was thinking dress and jacket combo or at least smart cardigan. Any suggestions on where to look with a budget of 100 ish?

DGS was christened in a Roman Catholic church, most godparents wore normal day wear nothing fancy

There’s no need to go super smart. I wore jeans and a pretty top.