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A great pillow gets your neck right. It does nothing for your hips, your shoulder pressure, or how long the pillow survives. These are the add-ons that matter for side sleepers specifically; not a random pile of bedroom gadgets.
Three are close to essential: a knee pillow to keep your hips and spine stacked, a zippered protector to keep the fill clean and the warranty valid, and a cooling case if your pillow runs warm. The rest are worth it depending on your setup.
The one accessory every side sleeper should own. A pillow between the knees keeps your top leg from dragging your hip and spine out of line; which is half of why side sleepers wake up with lower-back ache. A long one separates the whole thigh, not just the knees.
Tip: Pick a longer, contoured one if you shift around; a short wedge slips out.
A zippered protector is the cheapest way to double the life of a good pillow. It keeps sweat, oils and dust mites out of the fill, and most pillow warranties quietly depend on the fill staying clean. Fully encasing with a zip beats a slip-on cover.
Tip: Get the fully-zippered kind, not an envelope flap. The flap leaks.
If your pillow runs warm, the case can claw some of it back. Bamboo-viscose sleeps cooler and wicks more than cotton, which matters most with memory foam that traps heat. A smooth case is also kinder to hair and skin than a rougher cotton weave.
Tip: Match the case to your pillow size so it isn't tight, a stretched case flattens loft.
Side sleepers put all their weight on a shoulder and a hip. If your mattress is firm, those two points become pressure points no pillow can fix. A few inches of foam lets the shoulder sink in a little, which also lowers the loft your pillow needs.
Tip: Softer mattress = you need a slightly lower pillow. Re-check your loft after adding one.
A full-length body pillow gives a side sleeper something to drape the top arm and leg over, which stops you rolling forward onto your shoulder. This one is shredded foam, so it's adjustable and breathes better than a solid bolster.
Tip: Hug it with the top knee forward, that's the position that unloads your hip.
Silk's appeal is friction, not luxury. Pressing one cheek into a pillow for hours creases skin and tugs hair; silk slides instead of grabbing. It's the pick if side-sleep face creases or bed-head bother you.
Tip: Check the momme (fiber weight); 19 to 22 is the sweet spot for durability.
The quiet secret of adjustable pillows: they flatten slowly over a year or two, and a bag of refill fill brings the loft back instead of making you buy a whole new pillow. Broad-shouldered sleepers also use it to push an adjustable pillow taller than it ships.
Tip: Add a little at a time. It's easy to overshoot and end up too high.
If you use a CPAP and sleep on your side, a normal pillow shoves the mask and hose into the bed and breaks the seal. This one has cut-outs that give the mask room, so you can stay on your side without leaks waking you up.
Tip: Line the cut-out up with your mask before you settle, small shifts cause big leaks.