This method only works for specific types of materials (like cotton). Also, you will need to make sure that the water is not just warm, it’s boiling.
To use this method, boil a bucketful of water. Next, carefully put the scrubs in the water with a pair of tongs and let them soak for 5-10 minutes.
Remove the scrubs and let them dry out.
Shrinking by heat might be hard. You might overdo it ... or not get the exact results. Sewing is an option if you have the skill (and actually, it is not that hard).
You could hem your pants, or take in your tops.
If you're not comfortable sewing it your self ... just leave it with some local seamstress. It is cheaper than you might think (and if you get together with some colleagues you will most likely be able to get some batch discount too).
The results will be a scrub that fits your body exactly. For many it is worth the cost.
To shrink scrubs, you would need to dry them on the dryer’s warmest setting. However, it also matters what material your scrubs are made of.
Cotton scrubs may shrink a full size when they come out of the dryer, while a mixture of cotton and polyester (most commonly used today) might not shrink all that much.
Just to be safe, the first time around, set the dryer to medium heat. If the scrub doesn’t shrink to your desired size, you can always run it through the dryer again.