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This is my favorite top in my closet. The built in bra is compressive and cute. It and allows me to run around with kids or go out on a date. The thick fabric makes it not stick to my lower half in an unflattering way. I usually wear a M in Free Label tops and that's what I have in this. That said, I could probably wear a large comfortably if I didn't love the tight fit.
I purchased this top in an XL, but I think you could size up if you wanted to. I love the Dani bra for it's reversibility and this takes the best part of the bra and makes it into a tank.
I had dani bras before pregnancy and loved them. But now that I'm nursing, the Dani style tops have been a dream. I wear the Dani bras a lot but this Dani tank is perfect as a bra/top so I don't have to lift my shirt to nurse (and make my belly cold). I wear it as is or with a comfy sweater or cardigan over top. Very comfortable and easier than the other "clip" style nursing bras I have. I used to be between a small and medium in size but now post-partum the medium is just right. I do wish the arm holes were bigger (gets my deodorant all over the fabric) but I think they've changed that since I purchased.
Second one I bought. I sized up from my usual XL in the Dani bra. Fits over my 9 month pregnant belly and it is going to make a great top for nursing!
I found this style fits more snug than other styles so consider sizing up. If I wear it v side facing front and am going about my day at home I've noticed a few times my nipple actually pops out! I don't have a large bust but I guess something about the fit! I have to pull it over for the "more coverage look" if I go out of the house but then it leaves a dent line across my other boob which i dont love. That all being said the fabric is very nice. For reference I have a slim build with about 34b bust.