This Underworks compression shirt is great for me and for my goals.I will attempt to give all of my "stats" & why i ordered the size i chose. I am 5'8" tall, 155lbs. Under the 'bust' i measure 35 inches, 42 across the widest part of my chest. In femme clothing i wear a 36-38 D-DD cup bra depending on manufacturer; my "dress size" is approx a "woman's" size 10. Underworks advised that i take my rib and "bust" measurements, average them, and per the size chart, order a size medium.First off: thanks to all reviewers who mentioned this: step in, pull up! It will stretch over soft hip flesh far more easily than over the bones of your shoulders. You're likely to get "stuck" in it if you pull it over your head!Things to consider about fit. The edges "show" through a thin shirt, especially around the underarms. It also bunches and can ride up a bit through the waist; guys who have a shorter stature and/or slender waist may notice this more. I adjust it a couple times throughout the day but it's hardly a bother. Compared to other binders and methods this is totally acceptable for me. The bottom of the undershirt sits on me about where it does the male model in the photo - mid to low hip. As mentioned i am tall, 5'8". If you're a shorter guy, it will pull down low over your thighs.So does it bind? Yes, very well! - but not perfectly. If I bind down, i do look flat chested, but there is a telltale thickness around my ribs which is unflattering. Binding up, i end up with a small bust-like chest, perhaps an "A" cup. I prefer to bind up for a trimmer v-shaped look around the ribs. Mostly i just look athletic, but if someone were really "looking" for boobs on me, they could probably detect them. Overall, my naturally very full/soft/curvy bust miraculously appears high, tight, hard, athletic, and significantly flattened. A little bonus control in the tummy area encourages engaged core muscles, which is great for holding posture & making the shoulders look broader.Although the binder isn't that perfect boob-erasing miracle we all hope for, my feelings of delight and relief upon seeing my chest firmly compressed while still being able to breathe are reflected in my rating of five stars. FTM guys & transmasculine persons: read reviews, do your research. I wish i could recommend a binder that *perfectly* conceals full D+ cup sizes down to flawless manly flatness while still maintaining a flexible range of motion for a full day's activities, but i have yet to find one. This comes very very close.I am extremely happy with the overall effect and quality of this Underworks undershirt/binder. I have washed it gently several times. It remains flexible & comfortable, and has maintained its firmness. I feel attractive when i wear it, it has increased my confidence dramatically, and i'm ordering three more.