Heles could be the one helping Muse finding the rigth dress for her now hear me out:
Heles: Muse, Don't worry about ANYTHING, I got the rigth dresses opinions for you
Heles: Yes darling! Go ahead and try these on!
*1th option : Loong sleeved dress with a huge ass grown*
Heles: What do you think?
*2th option: Heles, babe that's not even a dress that's a lingerie*
Heles: What about this? It's very trendy in our universe!
Muse: No, Waaaaaaay too slutty for me
*3th option, fancy sleeveless with and red dress with sparkles*
Heles: This looks good on you!
Muse: Helen, I litterally look like an used TAMPON dipped in GLITTER
*4th option, TALIESIN'S CLOTHES 🤡*
Heles: What do you think? Your friend asked me to try this on-
Muse: Cut this shit out, Girl I'm not going to play the violin in a local circus, I'm about to get married to a fine ass angel woman, so is better if you BE FUCKING FOR REAL
Heles giving Muse a pretty sl-tty outfit because it's "their signature wedding outfit" in their universe should be canon because that Universe is the "Universe of Love and Beauty" so she has probably immersed herself in the culture of that universe.