I intentionally resisted putting up measurements for these because I find that measurements on down outwear tend to be very misleading and can just lead to more confusion.
All three just fit small all-around, like all of our Esemplare offerings, so you should be safe to go with one size up from your "normal" lettered size, and that will still be a relatively slim and cropped fit - perfect for layering or as a jacket over something light- or mid-weight.
I just took a closer look at it, and based on the way they're stitched on I would say yes, it would come off easily with a seam ripper. I can't vouch for if there would be any noticable holes left in the nylon shell, however. FWIW, the tag is very small and appears only on one side.
Seriously. Vests are kind of like double-breasted suits or even monks; you've either made the jump and have one (or more) or you haven't. If you haven't, then it's probably not on your radar. But there may (will?) be that moment when you see the right one and think, "Ok, I like that one; and I think I can rock it" and then it suddenly becomes an empty space that needs to be filled.
I clambered over the fence on vests a year or so ago when I found a really, really nice one that I liked and "had to have". While that one still hangs in my closet awaiting appropriately demanding weather (it's down filled and surprisingly warm!) I've since gotten a few more that are lesser pieces but more versatile for my not-quite-cold-enough locale and they've filled a niche very well; a nice way to change it up a bit.
I still want to do the pitti'esque vest-over-the-jacket look but can't bring myself to walk out the door with it. Clearly, I'm still fence straddling a bit...
I'm a firm believer in The Down Vest and it's true that it's something you sort of really get into once you've made the leap. That said, I can't stress enough just how cool the down jackets are too - the patterns may seem out there in the photos but they're surprisingly easy to wear. I might try to snap a pic later in one of them if I get a chance. One of my most-worn garments 3 seasons of the year (aside from a pair of jeans) is a lightweight down jacket though, so I might be a bit biased...