The amount of fabric that is turned under on a hem depends on the fullness of the garment.
A very straight hem, like that on the black cotton if you see cake skirt pictured above, can be turned up an endless amount- or 2” then another 2” which nicely weights the garment.
If the hem is straight, you can turn it up as little or as much as you like.
A full hem, like that on the gray tonal rose print velvet if you see cake dress pictured above, can only be turned up a little bit- for this particular styling ¼” then another ¼” worked best.
Assess the fullness of the garment you are working with before you attempt an alteration- a very full hem that is turned under too much will buckle and look like a whole lot of terrible!
Both garments are available at the Sara Duke Factory Store Saturdays 10 am to 6 pm, by chance or by appointment anytime- please contact firstname.lastname@example.org for more information.