I think it's great, and knowing you just a little, a very good choice. The leather shoulder strap will be great at turning it from fashion to classic and easy to wear.
Go for the colour that makes sense to you.
My reckoning: the blue/red web-stripe doesn't stand-out so much on the red but it's such a vibrant bag anyway. The black has both green/red and blue/red going on so still has plenty of interest and the ivory is more 'French' because of the tricolour strap and also TDF IMO but also difficult for obvious reasons. I think my heart would go towards the ivory.
I have plenty of smaller vintage bags like this and can always jazz them up with a ribbon. I'd prefer if they were 28 or 30cm wide.
Thank you for your most helpful pointers!

My heart is also pining for the white/ivory one the most- like you said, the strap colors go beautifully against the leather and my eyes just go right to it when I look at all the pictures in this thread and elsewhere. But it does scare me a bit since I've never had such a light-colored bag...
Red is also gorgeous- and I actually don't have any red bags either (crazy, huh?) so either color would be a great addition to my collection. I will visit the boutique in near future and see which one "sings" to me! That could be totally different, it happens to me every so often.
I will take pics if I can- meanwhile I would love any other pictures, opinions, and most of all reveals/reviews!
