Underwear for High Slit Dress and Thigh Slit Gowns

What underwear to wear with a high slit dress

A high slit changes the question. With most dresses you worry about lines showing through the fabric. With a slit, you worry about the underwear itself showing through the opening. Every step pulls the slit open, sitting down opens it further, and getting out of a car opens it all the way. Whatever sits on the hip on that side is going to be seen by someone at some point in the night.

So the rule is simple. Nothing on the slit side should sit higher than the top of the slit. In practice that means a low-rise thong with thin side straps, because it is the only cut whose side sits lower on the hip than a thigh-high slit. A brief, a hipster or a boyshort has a wide side panel that reaches the same height as the slit or above it, and it shows the moment the dress opens.

The No-Show Seamless Thong is the pair we would pick for almost every high slit dress. It is low rise, the edges are laser-cut and bonded instead of sewn, and it comes in Nude Deep, Blush, Black and White. It costs $12, and any 3 pairs are $32 in your bag.

Best underwear for each kind of slit

Your dress	Best pick	Price	Why it works
Thigh-high side slit on a fitted satin or jersey gown	No-Show Seamless Thong in your skin shade	$12	Low rise and thin sides stay below the slit, bonded edges leave no line on satin
Thigh-high slit on a flowy chiffon or crepe maxi	Everyday Cotton Thong or the seamless thong	$12	Loose fabric hides edges, so a soft cotton thong is fine for a long day or a summer wedding
Front slit that stops above the knee	Bonded Seamless Hipster	$12	The slit never reaches the hip, so you can have full back coverage with flat edges
Slit that is meant to show a little lace	Scallop Lace Thong in Black or Wine	$15	For a date or a party where a glimpse of matching lace is part of the look
Strapless or one-shoulder slit gown	Smooth Strapless Bra plus the seamless thong	$45 plus $12	Molded cups and a silicone band stay put, no straps to hide at the shoulder
Slit gown in thin stretch jersey that shows every ridge	Smoothing Bodysuit in Nude Deep	$54	One smooth layer from bust to hip with no waistband line, if the slit stops below the hip

If you buy one thing, buy the seamless thong in the shade closest to your skin. It handles side slits, front slits, satin, jersey and chiffon, and it is the pair that still works when the slit opens further than you planned.

Do you wear underwear with a high slit dress?

Yes, most people do, and they choose a low-rise thong in a skin shade so it cannot be seen. A thong gives you a layer of hygiene and peace of mind with almost nothing on the hip. Going without is a personal choice, but with a thigh-high slit a skin-tone thong is the safer option.

The reason to wear something is not only modesty. Satin and crepe gowns are often dry-clean only and expensive to clean, and a pair of underwear protects the dress at the crotch. A cotton gusset also keeps you more comfortable through a long event. Every pair we sell has a 100 percent cotton gusset, including the seamless and lace styles.

How do I keep my underwear from showing in a slit dress?

Wear a low-rise thong with thin sides, in a shade close to your skin, and check it in a mirror while walking and sitting before the event. If the side strap still peeks out, wear it lower on the hip, or put a small piece of double-sided fashion tape at the top of the slit so it does not drift higher.

Do the test properly. Put on the dress and the shoes you will wear, then walk toward a mirror, sit on a chair, cross your legs and stand up again. Check from the slit side and from a three-quarter angle, because that is how other people will see you. Photos show more than mirrors, so take a phone picture of yourself sitting down. If any fabric shows at the hip, the cut is wrong for the dress, not the color.

Avoid stockings or thigh highs with a visible top under a high slit unless you mean them to show. A lace band at mid-thigh is exactly where a thigh slit opens.

What color underwear is best for a slit dress?

Choose a shade close to your own skin, not the color of the dress. If the slit opens for a second, a skin-tone thong reads as skin and nobody registers it. A black thong under a red or emerald gown, or a white one under black, is the version people notice.

Our seamless thong comes in Nude Deep, a warm caramel brown for medium, tan and deep skin, and Blush, the closest match for fair skin. Between two shades, go with the deeper one. The exception is a black gown with a black thong: that matches well enough, and some people prefer it under dark fabric. For white, ivory or pastel slit dresses, the color advice on the underwear for white dress page goes into more detail.

What do you wear under a dress with a slit in the front?

A front slit that stops above the knee leaves your hips covered, so a seamless hipster or brief with bonded edges works and gives more coverage than a thong. A front slit that reaches high on the thigh needs the same low-rise seamless thong as a side slit, in your skin shade.

Front slits are the ones that open most when you sit, so do the seated mirror test even if the slit looks modest when you stand. Look at the inside of the thigh, too. A leg edge that rolls or a gusset in a contrasting color can show on a deep front slit, and a seamless pair in a skin shade solves both. For a slit dress that is also tight through the hip, the seamless underwear for bodycon dresses page compares cuts for very fitted shapes.

Slit dresses for weddings, galas and date nights

Most people buying underwear for a slit dress have an event on the calendar: a black-tie wedding, a gala, a holiday party or a date. Order at least a week ahead. US orders ship in 3 to 7 business days in a plain mailer, free on orders over $50, which leaves time to try the pair on with the dress and swap a size if you need to.

A practical order for one event is two seamless thongs in your shade (one to wear, one spare in your bag) and the Smooth Strapless Bra if the gown is strapless or one-shoulder. That comes to $69 with free shipping. If you have several events this season, any 5 panties are $45, mixed across cuts, colors and sizes, and the full range of no-line styles is on the seamless underwear page.

Check your size before you order. Measure around the fullest part of your hips and compare it to the panty size chart: XS fits hips of 34 to 35 inches and XXL fits 46 to 48 inches. A thong that is too small cuts in at the hip, and a line at the hip is exactly what a slit shows.