The easiest way to style a denim midi skirt with ankle boots is to decide what you want to see between the two hems. Leave a clear strip of leg for a casual daytime outfit, or connect the boot to the skirt with opaque tights in a similar shade. If your skirt is long enough to overlap the boot, check the overlap while you walk. The skirt should pass over the boot shaft without catching.
Start with the skirt you already own. A straight dark denim midi with a walking slit works well with a close-fitting boot, while a wider skirt gives you more room to try a heavier sole. Use the outfits below as starting points and make one change at a time so you can see which detail improves the fit.
Check where the skirt and boot meet
Put on the skirt at the waist position where it naturally sits. Pulling it higher for a mirror check can make a troublesome hem look fine until the skirt settles back down. With the boots on, face the mirror straight ahead and turn sideways. Look at the distance from the bottom of the skirt to the top of the boot, including the back of the shaft. Some boots dip in front and sit higher behind the ankle, which changes the look from different angles.
A visible gap works best when it looks deliberate from the front and side. You do not need to measure it. If the boot appears to touch the skirt in one view and barely clears it in another, try a lower shaft or add tights that match the boot. A skirt that fully overlaps the boot can look good as well. It simply needs enough room to move past the shaft.
Take a few normal steps, then sit and stand. A narrow hem may swing inward and catch on a pull tab even if it clears the boot when you stand still. A front or back walking slit can give a straight skirt room to move, but it only helps if you can take a full stride comfortably. If the skirt catches repeatedly, use a boot with a smoother shaft or choose a different skirt for that pair.
Look 1. Dark denim, a charcoal knit and black leather boots
Pair a dark indigo straight skirt with a charcoal crewneck and black pointed ankle boots. A low block heel gives the outfit a little lift and is easy to style with a longer hem. Choose a shaft that sits close to your ankle if the skirt narrows at the bottom. This combination works for dinner, a casual office or a day when you want a small step up from jeans.
Let the knit end near the waistband, or tuck just enough of a fine knit to show where the skirt starts. A thick sweater pushed all the way into a fitted denim waistband can bunch and pull on the skirt when you sit. If the sweater is longer, try leaving it loose and check the overall balance with the boots on. A fitted skirt can carry a longer top when the lower leg and shoe still have a clear outline.
Pointed toes are one option. A gently squared toe works with the same palette and can feel more relaxed. Choose the toe box that fits your foot first. A longer-looking shoe adds little to the outfit if the toe pinches or you change your stride to keep it on. A small shoulder bag in black or deep burgundy completes the look without competing with the denim seams.
Look 2. Mid-blue denim, a cream knit and tan suede boots
For a daytime outfit, wear a straight mid-blue midi skirt with a cream knit and tan suede ankle boots. Choose a low shaft and leave a visible strip of bare leg below the denim. The tan boot and lighter top soften the contrast with the skirt, while the suede adds texture beside the woven denim. A low block heel or a flat boot can both work here.
Choose socks that sit below the shaft if you want the gap to read as bare leg. Walk around for a few minutes to check that your socks stay in place. If you want socks to show, make them part of the outfit by repeating their shade in the top or bag. A visible cream sock can be intentional with a cream knit, but a narrow line of white elastic over a tan shaft can look like it slipped into view.
For errands or a long day out, try this combination with a crossbody bag and a jacket that ends around the waist. A cropped jacket keeps the waistband visible when it is closed, though a longer jacket also works if you wear it open. If the forecast makes suede impractical, swap in smooth tan leather and keep the same low shaft. The boot height and the gap do most of the work in this outfit.
Look 3. Dark denim, black tights and black ankle boots
When the bare-leg gap feels too abrupt or the weather is cool, wear opaque black tights with black ankle boots and a dark denim midi skirt. Try a cropped forest-green jacket or another short layer over a simple top. The tights create a continuous line down to the boots and give you more flexibility when the skirt and boot shaft sit close together.
Try the tights and boots in daylight before deciding how close the shades need to be. A matte black tight and a polished black boot can look different in texture while still reading as the same color. If the tights are more sheer than you expected, move near a window and bend your knee. This is where the color will look lighter. A more opaque pair gives you a steadier finish across the visible area.
Matching tights will soften the visual break, but the fabric still has to clear the boot. Check again after adding your cold-weather layers, since socks over tights can change how the shaft sits. If the boot has a bulky side buckle or an exposed pull tab, see whether it catches on the hem. A smooth leather shaft can be easier to wear with a close-cut skirt.
Make your existing boots work
If your favorite pair has a chunky sole, try it with an A-line skirt or a straight skirt with a more generous slit. Give the boot a little more room under the hem, then keep the top simple so the sole has space to stand out. A wide skirt can balance a heavier boot, but if the outfit feels bottom-heavy, repeat the boot color near your face with a dark knit or jacket.
If the skirt is very long, check it with your actual everyday shoes before altering the hem. A skirt that catches on a tall shaft may sit perfectly over a lower Chelsea boot. Conversely, if you wear the long skirt mainly with that tall pair, a small adjustment to the hem can help. Pin the proposed length temporarily and test it while walking and sitting before committing to an alteration.
Use accessories to repeat one color or texture. A brown belt can pick up tan boots, or a plain black bag can echo black leather. If the skirt has contrast topstitching, keep other details simple until you know how prominent that stitching looks in daylight. A quick full-length photo is often enough to spot whether a belt, bag or sock is creating a stronger break than the one you intended.
Conclusion
Pick one of three approaches. Use a dark knit and black boots for a compact palette, leave a clear gap above tan boots for a lighter daytime look, or connect black tights and black boots when the hems sit close together. Check the outfit from the side and take a few full steps. If the skirt clears the shaft comfortably and the transition looks deliberate, the combination is ready to wear.