Charlie...doesn't know how much help he can provide with looking for a bridal dress, but Hermione is family, and he gets the advantage of sneaking a glimpse at the dress before his brother, so he easily accepts when he receives her text.

He meets her at the shop with a grin and a wave, just as she's trying on a dress.

"Ron will faint at the altar, guaranteed," he tells her, his grin widening into a smirk.