I have a friend who is going for job interviews. She is bigger than me and asked me to borrow some work clothes to wear to interviews. I just said I don't think I'll have anything that fits her. She said but I used to be the same size as her so I just have something (I was overweight now normal she is still overweight) but I don't think we were ever the same size
She came round a few weeks ago walked in my bedroom & started looking through my clothes ( we have been friends since we were teenagers so I think she felt comfortable doing it even though it was a decade ago we used to rummage through each other's wardrobe) and starts picking things she thinks might fit her. Before I can say anything she's got a dress on and saying it fits her. It really didn't and was stretched so badly. I tried to tell her nicely that she might need a bigger size but she seemed so happy that size stretched over her I didn't want to push it as she's really sensitive about how she looks. I am now a smaller size so hopefully won't need it but it was a lot of money for me and I was hoping to either sell it or tbh I've gone back up couple of stone since last year so perhaps I might need it again one day soon. 
Anyway she's given it back and it's now stretched and basically ruined, completely baggy around the bum area. Aibu to say something and if so what would you say?! I can't afford another one and as it's part of a suit I can't really replace the whole outfit either.