Context: I'm writing a short story that serves as some background for a roleplaying character who is a fantasy dwarf called Fin, and as such I'm not expecting it to ever be published in its current state. I might end up taking concepts or ideas from here, and I'd like to practice good writing even if this story won't be widely read. The group I roleplay with are super chill, so don't let any RPG considerations affect your answer.
The character whose background story I'm writing has spent most of the first part of the story trying to convince their mother to let them wear their heirloom field armour as part of a cultural ceremony. The only snag is that the daughter is plus size, and much broader in the hips and with a larger belly than their mother (at least, when she wore the armour last).
This is quite deliberate on my part, as until now the character is expecting to follow in their mother's footsteps exactly, not really thinking for themselves. Not being able wear the armour will act as part of the inciting incident, and will kick them into leaving home and starting adventuring by themselves. It's also to foil the mother's concerns - she stole the armour from her mother (the main characters grandmother), and is worried that if her daughter follows her footsteps in wearing it, she may do the same. Running away regardless (i.e. without the armour), feels like a nice way of showing the difference between the two characters and seeing how the mother acts when surprised.
I'm about to write the scene where the main characters finds out the armour is too small and just how badly it fits, but I want to do so respectfully. I want them to be upset at the revelation that she doesn't fit into the armour (she knows she's fat) without belittling them. Part of my conflict is the character, as written, lacks a lot of self-awareness/over-confidence which I've played on humourously before.
Here is an excerpt where she tried to use her weight to an advantage in convincing her friend, who is a Gnome she can hold her drink against a 8' tall person:
Ostensibly her gnomish companion was here to celebrate Fin "finally becoming a warrior", or so the dwarf had claimed, so it was no surprise the little gnome was looking put upon at the idea of a drinking challenge with such a colossal brute.
Even though she was not directly involved, Fin watched the gnome shrink back to the shadows, trying to put Fin between them and the mountain of an opponent.
"...sorry... he's huge..." came the whimper.
Baulking at the lack of confidence in her drinking prowess, Fin grabbed a handful of her belly rolls as she boasted "And I'm not?! Where do you think I got this?”
Mamma's cooking Fin thought, that's where. The gnome didn't need to know.
In this scene the character doesn't think her weight or size of belly mean she can drink, she's just trying to use it to her advantage in convincing the gnome.
How can I write the armour fitting scene respectfully though? I'm not plus size myself, but I have loved ones who are. I've not been able to use that second hand experience however, because I've not seen them experience this exact situation.
I'm mainly conscious that this is a situation plus-size and larger people experience regularly and I don't want to dismiss their difficulties nor make them feel uncomfortable in my descriptions.