You know the fitted vs. relaxed fit debate is an issue of fashion and attitudes towards bodies over time too. I have essentially a perfect hourglass figure (I hate the term too but that's what it is and it distinguishes it more from the exaggerated hourglass), but emphasising the boobs, waist, and bum all in one does the same thing as overdressing (which technically suits me best), kindly I look like a time traveller, realistically, it dates me and makes me appear much much older than I am. Very easy to tip into frumpy and matronly (as that's what dated fashion gets associated with) and that's predominantly what I associate these days with curvy body types wearing very form-fitting outfits. I blame the Kardashians and Herve Leger dresses. Over time (but it's many many years) it'll switch up again, same way boobs are now out of favour for bums, whereas when I was young a large posterior was the most horrendous thing to have. Anyone remember saddlebags? They were a massive insecurity for so many women, haven't heard anyone moan about those in a very long time.
I'll draw up a few sketches later of necklines that are most flattering to larger breasts, they're all quite structured and require extra steps in patterning, hence you don't see them anymore and why most modern fitted styles, despite following similar silhouettes, fall flat in comparison. Equally, the originals are quite obviously dated.
It goes beyond t-shirts falling just right, fashion has been economised by fast fashion for quick turnover and a democratised fit. It means you need to be much more discerning to get a right fit and can't really rely on old-style staples as you once could. It's why I find it more helpful to understand the visual lines that flatter your body and match that with the cut and fit of clothes, rather than predetermines silhouettes.
sing, I did just remember (though never stayed there myself) that the Holiday Inn at La Republique (may be a Crowne Plaza now) is very family friendly, with larger family rooms. I wouldn't recommend using Hotwire or one of those other secret hotel sites as your luck is already tested in Paris when you know which hotels are out there but factoring in the children it seems a recipe for disaster.
Have you looked at the Left Bank, around the Bibliotheque Mitterand? Or around the Palais Congres? They're both a bit away from the centre but have the regional train lines rather than metro (same tickets and still within zone 1 and can easily switch between the two, just faster and fewer stops) which drops you at Les Halles or on the other side of the river of that opposite the Louvre in 5 minutes or so. They're business areas so will probably have more vacancies to fill in the holiday period than other areas. Quite a few serviced apartments hotels there too.
Midlife, Juliette Binoche is larger these days and certainly has boobs. I'll ponder on some more, they're out there, more likely to be actresses or singers so likely dressed by stylists somewhat.