The best trouser hem for platform shoes depends on how much of the shoe you want to show. Cropped hems put the footwear in view, straight hems can meet the top of the shoe, and wide-leg trousers create a longer line when their length stays clear of the ground. There is no single required hem length for every platform or every body.
Instead of choosing by a styled photograph alone, try the complete outfit standing, sitting and walking. The same trousers can behave differently with another sole shape, even when both pairs are called platform shoes.
Start with the shoes you will actually wear
Choose the exact footwear before deciding whether trousers need hemming. Comfy Women Shoes carries options such as Comfy Slip-On Platform Shoes and Comfy Casual Derby Platform Shoes. They are different silhouettes, so do not assume a trouser length that works with one will look identical with the other.
Put on the socks you expect to wear and fasten the shoes normally. Then check the trousers in a full-length mirror. Looking down at your own feet changes the viewing angle and can make the hem seem shorter than it appears to someone standing in front of you.
Cropped trousers: make the gap intentional
A cropped hem leaves the upper of the shoe visible. This is useful if you want the platform shape to be part of the outfit rather than hidden beneath fabric.
Try two versions using clothes you already own: a slightly higher cuff and an uncuffed hem. Compare the whole outfit, including the top, instead of studying only the ankle. One may feel more balanced with a relaxed sweater, while the other may work better with a shorter jacket.
Socks also become a visible styling choice. A color close to the trousers creates a quieter transition; a contrasting sock makes the gap a detail. Neither approach requires buying a matching set.
Straight-leg trousers: watch where the fabric lands
A straight hem may touch the top of the shoe or finish just above it. The important practical check is whether it falls back into place after you move.
Sit down, stand up and walk a short indoor route. If the hem catches behind the heel or stays bunched over the shoe, try a small length adjustment. If the cuff repeatedly opens, an altered hem may be more useful than relying on a fold that will not stay put.
Bring the shoes to any alteration appointment. Explaining that you wear “platforms” gives less useful information than letting the tailor see the actual pair and your preferred finished length.
Wide-leg trousers: check the moving hem
Wide legs can partially cover a platform, leaving only the front or edge of the sole visible. This can create a deliberately continuous shape, but the trousers still need to stay out from under the shoe.
Check the back hem as well as the front. Fabric that looks tidy in a mirror can trail behind you when walking. Turn, take a step backward and check a stair carefully in a safe setting. If the fabric gets underfoot, choose a different length before wearing the outfit out.
Do not use a taller shoe solely to rescue trousers that are too long if you are not comfortable walking in that pair. Altering the trousers may be the better solution.
Keep one reference outfit
Once you find a combination you like, take a full-length photo and note which shoes and trousers you used. It becomes a useful reference when choosing another color or discussing alterations later.
Start with one successful outfit rather than rebuilding your wardrobe. The right hem is the one that gives you the proportions you want and behaves properly when you move—not a number copied from somebody else's outfit.