The scrub set that works for a twelve is not simply a nicer version of one that works for an eight. Three things change across a long shift - your waistline, your temperature, and whether the fabric still holds its shape - and the garments that handle those are not always the ones that feel best in the first hour.
Your waistline changes, and the waistband decides how that feels
Across twelve hours most people bloat somewhat, particularly if they eat at 2pm or do not eat at all. A waistband with no give becomes genuinely uncomfortable in the back half of the shift.
A yoga waistband accommodates that and stays put. A flat front reads smarter and has no accommodation built in. A drawstring is adjustable and gradually loosens, so you re-tie it twice a shift. If you know your waistline shifts, that is an argument against the flat front regardless of how it looks.
Rise matters more than you would guess
You bend over a bed several hundred times in twelve hours. A low or mid rise creeps down, so you develop the habit of hitching your pants up - a small irritation performed two hundred times.
A high rise stays where you put it. This is not a style question and it is the reason high-rise silhouettes dominate in this profession despite being out of fashion elsewhere.
Temperature, which is where fabric weight earns its keep
Hospital temperatures swing. Units run warm when busy; overnight hours run cold. Twelve hours in the wrong fabric weight is unpleasant at one end or the other.
Weight in ounces per square yard is the number that predicts this, and almost no brand publishes it. Where it is published the spread is large: the lightest top here is 6 oz/yd2 and the heaviest is 9.7. That is the difference between a top you can work a warm unit in and one you cannot - and you can only know in advance if the brand tells you.
The complementary answer is layering: a lighter top plus a jacket you can remove covers both ends of the swing better than one mid-weight garment. It is also why the jacket is on this page.
Whether the fabric still holds its shape
Garments relax as they warm and move. By hour ten, a top with poor recovery has bagged out at the shoulders and a pant has lost its line. Two features resist it: elastane content for recovery, and structural details like back darts and a back yoke that build shape into the garment rather than relying on the fabric.
Anti-wrinkle performance belongs here too. It sounds cosmetic and it is not entirely - looking dishevelled at hour eleven affects how you feel at hour eleven, and the fabrics that publish an anti-wrinkle claim genuinely hold it.
The laundry arithmetic of a long-shift rotation
Four twelves a week means four sets used, and you need a fifth so you are never washing one overnight. That is five sets of whatever you choose - which usually pushes the sensible decision toward the mid-market, because five mid-market sets beat two premium ones. The premium pair will always be the one in the wash.
It also means more wash cycles per garment per year, and that is what kills rayon-heavy fabrics. The laundry question from the main roundup applies with more force here.
The rest of the twelve-hour kit
Scrubs are one of three things that decide how hour eleven feels. The other two are shoes chosen for hour eleven rather than hour one and compression socks, which address the leg fatigue nothing else fixes.