I have sloping shoulders, although it is less pronounced now that I have been trying to do some exercises to strengthen my shoulder muscles. I also have a short neck and bad posture which both exacerbate the sloping shoulder thing.
I prefer jackets and tops with strong shoulder lines - I LOVE high cap sleeves, puffy shoulders, and slight shoulder pads even though they don't generally get much love here. Not like huge 80's shoulder pads, just a slight lift works wonders for my shoulder line. The trick with cap or puff sleeves is that the extra volume has to be on top of your shoulder rather than on the side of your arm if that makes sense. You want to add vertical height to your shoulder, not width. A wider neckline helps a lot too - for example a tank with wider set straps is better than a halter or racerback style. Boat necks don't work for me because of my short neck but they do work to straighten the shoulder line because of the strong horizontal line.
Things that are not as flattering to sloping shoulders are raglan sleeves, close-set skinny straps, halters, racerbacks, dolmans, although there are exceptions to all of these. It's just a lot more work to make them work.
Photos 1-3 are various things with shoulder-strengthening properties on me. Photo 4 is more what my shoulders actually look like. You can see they appear more sloping in that photo than in the first 3. You can also see that I am wider across the upper arm/chest than across the shoulder.
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