10 if you include the one in Astro which is on the way. The first one I bought was in Twilight, which I loved so much that when it wore thin on the shoulders (due to backpack straps) I simply bought another one exactly the same to replace it!
I fluctuate between sizes and I've been buying them for years - peep the vintage Ika print, iykyk - so I have sizes M to 3XL and honestly the 3XLs still fit fine, I just actually use the waist tie. I don't normally use the waist tie for extra comfiness and because of the cut it's loose without looking a shapeless sack.
I keep buying Viviens because they tick all the boxes for work: neckline not low, hemline not high, shoulders covered for sun at lunch, pockets fit my huge phone and enough other stuff that I don't need a handbag, fabric thickness and stitching are consistently good.
The only feedback I have is around colours and button placement, but these are personal preferences. I sew in a snap to make an (invisible) additional button halfway between the bottom button and the hem. This stops the dress from flapping open at the split on windy days. It only ever goes as high as mid-thigh, so if you've never bought a Vivien before don't worry, it's not indecent or anything. I just prefer it and I would be overjoyed if it was a real button with a button hole that's already there when I buy it.
I'd love to see more choices for Viviens in "warm" colours, but again this is just personal preference. For example, I have the Polly Pocket corduroy tunic in Zinfandel and I am OBSESSED with that colour.
I have about half a dozen other Karma East dresses in different cuts but it's hard to go back to other dresses when you haven't had to think about bra vs neckline logistics, or do-I-wear-tights-under-this, or the existence of zips for a while.
If I win the $200 voucher for writing a review you'd better believe I'm using it to buy two more Viviens haha