Mama Night gives me weird vibes
I don't know how to flair this, this is no hot take. But something about Mama Night is off, for a few reasons.
The "dress" that is not a dress
You know the one, the one that is small, sheer and described as the size of a napkin. THAT dress. I guess it could be sweet for her to make dresses for her future daughter-in-law, but why one that shows so much skin and would result in everyone being flashed because of a strong gust of wind? It's such a strange choice of a dress, why oversexualize your daughter-in-law like that? I genuinely don't get it. Makes it even worse when Feyre puts on the very same dress to show her pregnant belly to the rest of the world.
The Weaver's cottage
Okay, that's where it gets worse. The Weaver trial is inexplicable to me. Ah yes, let me send my son's fiancée to a Death God's house to see if she can get her hands on my ring. It reeks of "is my daughter good enough for my son?" mentality. And Rhysand knew, sent Feyre in there with no preparation and she survived of the skin of her teeth. Imagine if before her, other women went through the Weaver trial and either died or ran for the hills because of how crazy it all is? Would it have been so bad to keep the ring in a box and save it for when the time comes? Or I guess that's too normal.
Making the dresses in the first place
Now this might be a reach, but this comes from the fact that ACOTAR is so... Gender essentialist. In another universe where mates can be of any gender rather than man and woman (no I won't say male or female), there's something a bit... Weird about Mama Night making a whole wardrobe (with that dress). What if her son had fallen in love with another man? Would Mama Night change the outfits or force Rhysand to marry a woman? We are entering theory territory right now, but Illyria isn't very progressive. Women aren't allowed to keep their wings and boys are sent to war camp at 8 years old.
Now they lived in Velaris and I guess it's more "progressive" because Rita's is a gay bar. But it's possible that Mama Night had an Illyrian mindset. She saw nothing wrong with her son going to war camp and Rhysand doesn't seem to resent her for that. But it's very telling of how she could think.
I want to see making the dresses as a sweet thing but coupled with the whole ring trial, I can't help but see it through a critical eye.
Final Thoughts
I understand why some people have "boy mom" vibes from Mana Night (it would be nice if she had a name). The last part is just me theorising, it's not too serious, but again, in a world as gender confirming as ACOTAR, I could see a world where she doesn't imagine her son being with anyone else other than a woman or not being in a relationship in the first place. She also gives me potential overbearing MIL vibes. I shudder at the thought of my MIL giving me a dress that exposes the body so much. There's no justifiable explanation for that. I may have missed some other elements but these are the ones that give me pause.