Quality is good. I'm a small C and size 10 bottom and XL fit just right ( a tad small on the bottom) if your booty is any bigger than a 10 the bottoms will definitely be too small.
This bathing suit fits really good! It is made of durable material and is very vibrant in color and pretty. I would buy another bathing suit from this seller and in a different color. I read other reviews and some mentioned to go at least one to two sizes up. So I went two sizes up to be on the safe side. When I received it in the mail, it looked a little big but once I tried it on it fit perfectly! I definitely recommend going two sizes up. It will fit if you do so! For reference I normally wear a size small to a medium and I am 5'1, 100 Ibs, and a 32 C. I ordered the large in red, and it is more of a pretty magenta pink.
I ordered this bikini for my trip to Cabo. I was nervous because I dont usually order my bathing suits online, I like to try them on but this fit perfectly! Its so cute and I got a ton of compliments on it too. I followed the advice of ordering a size up. Im 57 and 145 lbs and ordered a Large. Im normally a 6 so I figured Large would fit and it fit great. The color is more of a hot pink not red tho. But I prefer hot pink over red so I was happy with it. And I got the suit within a couple days too. Overall, very happy with my purchase!