I’m 5’5.5” and 130lbs. I ignored amazon’s suggested size of medium and ordered a small in 2 colors. 1st color was black on bottom with white and coral color flower pattern on top. Fits great! I do not have loose or saggy material along the top in the back (my problem with other halter suits I ordered a medium in) it actually fits good around the torso. I like how the black on bottom slims! 2nd color was teal with pink flower pattern on bottom with solid teal on top. Still fits great in all the same spots but I do feel the black on bottom suit made my lower half look slimmer than the one with the flower pattern on bottom. Even laying on the bed side by side the pattern on bottom suit appears “bottom heavy” compared to the black on bottom suit, so if you are looking for a slim appearance to the midline/bottom maybe choosing a black on bottom style is preferable. I like the fit so much I plan to keep both though. The bottom has runching that slims the appearance of a small tummy pooch but I did not find it had much compression for my waist that fluctuates between 24.5-26.5” but I have a shorter torso that allows for more fabric in the mid section on 1 piece suits and that could play into that. I still found the stomach area flattering though and with some tummy control suit materials being “firmer” they end up cutting in at the leg holes on my hip and butt - this one does not which I do love. I have not worn these in the pool yet to attest to any color fading that I read in some other reviews and hope I picked colors that won’t do that. Love the adjustable halter top, allows for great support of larger bust if you tie it tighter. If you are busty you commonly deal with discomfort behind the neck with any halter top from supporting the weight (necessary trade off in my opinion though) - this swim suit does not magically change that but the straps are wider and therefore much more comfortable vs. a string tie style top. The inside liner cups are nice, decently large and do not give the appearance of “underlying nipple covers” from a side angle. They actually cover most of the breast from the front and with the compression from the halter tied a little tighter lay decently smooth/don’t give an awkward shape to my breasts - not sure how they will do once washed though. If I run into any problems with color changing/fading or washing issues I will try to update my review.