
Usually people who have to ask (for example, I can eyeball almost any bag and ID the designer, at minimum, if not the name, make, year, and model

- so I never have to ask someone what the brand is, even) aren't going to have the background info to even know where to start looking. I don't see anything too wrong without expressing the brand and "model" name if it can be done in a non-braggy way.
It's a bit uncomfortable with you're carrying a lovely Lanvin or Hindemarch or Givenchy and a stranger standing in line with you tries to find fault with it and then shows you her bag and .... it's just not quite lining up with her self-image as a bag-queen.

I still haven't figured out a nice way of handling those moments. But the "gift" excuse has never let me down and is still a nice way of saying - oh, here's what the bag is in case you want to look it up for yourself, but let's not discuss finances in public, k? That way you're not putting someone in a difficult and humiliating spot in a public setting - because people tend to remember those moments and it's a good way to make closet enemies, IMO.