Black Underwear Shorts | Black Under Dress Slip Shorts

Fusion Shortlette Anti Chafing Slipshort 9" Length (Black)

Size Guide

-The Original Shortlette®️-

Small Details Make the Difference

Undersummers Fusion Shortlettes®️ Anti-Chafing Black Underwear Slipshorts for Under Dresses

  • High waist & long leg gives this maximum comfort, protection, and coverage
  • Seam-Free Inner Thigh offers superior thigh protection
  • Stay-Put Leg keeps your legs protected during activity
  • Front seam flatters your curves
  • Soft, silky fabric lets legs and clothes glide
  • Lightweight, cool, breathable, moisture - wicking fabric
  • Cotton liner makes this a single layer solution
  • Stretchy, comfy fit.  Absolutely Not Shapewear.  Non-Compression fit.
  • 96% Polyester/ 4% Spandex, exclusive of trims, cotton gusset
  • Machine wash cold, line dry
  • Assembled in the USA


Type: Fusion Shortlette

Customer Reviews
4.7 Based on 299 Reviews
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Filter Reviews:
  • dresses
  • skirt
  • thigh chafing
  • relief
  • some
  • bike shorts
  • slipshort
  • office
  • wear
  • light weight
Tyeshia M.
Japan Japan


Another great buy!! I love the how it doesn't make your clothes bulky and it does the job!!

United States United States

Love these!

So comfortable. Nice fit, smooth and doesn't stick to my dresses.

M C.
United States United States

So Comfy!

I really love these.  Needed to be able to wear a dress to the office this summer and these were incredibly comfortable and fit well without adding any visible lines through the dress. 

Christine Z.
United States United States

Silky coolness

Love these! No rub, skims my curves, keeps me cool with a skirt. Get some.

United States United States

So Happy!!!!

I was so nervous about ordering but the cotton shorts I have been wearing just weren't working for me! I work in a commercial kitchen and it's hot here anyway and I sweat like nothing else!! But these are amazing!!! They truly do breathe and even when I'm sweating and soggy, these keep me dry and comfortable! I am so happy to have relief from the heat rashes and general misery I had. Thank you!!!

United States United States

Perfect for Walking!

The Fusion Shortlette, worn with a tunic or long tee is great for walking on hot and humid days! I have been wearing mine every day for my 2 mile walk along the lake.

United States United States

Life savers!

My fusion shortlets have made wearing dresses a pleasure once again. I wish I had discovered them earlier. Not tight and binding.

United States United States

Great buy!

These are cool, comfortable, and stay put! I wear them every time I wear a dress!

United States United States

Great length, not a fan of the lace

These fit well, sit at a comfortable length, and do exactly what I bought them for - no chafing. I find that the lace feels weird when my clothes brush against it, so I wish that there was a basic option in this length without the lace.

Kathryn U.
United States United States

I actually like wearing skirts and dresses!

I used to hate wearing skirts and dresses because of thigh chafing. Sure, I could wear bike shorts or leggings under them, but they were too thick or too warm or too binding at the waist. Undersummers, on the other hand, are light and comfortable, and don’t disrupt the line of the skirt. I actually plan on wearing skirts all summer because of them! I did balk at the cost a little bit, but they are very well made, and I expect will last quite a while.

Shelley N.
United States United States

Nice Fit

This slipshort fit very nicely and doesn't ride up. Love it!

Ellen M.
United States United States

Essential for my life!

These are an essential item for my wardrobe. Nice light weight, but not see through. They have shape but are not shape wear. I never get that compression feeling that I hate....just comfortable and stylish.

Andree L.

OMG these are so awesome!

OMG these are so awesome! The fabric is so light and comfy. The size is perfect. The workmanship stunning. I am seriously impressed.

Suzanne S.

Great product!

Great product!

Loleta S.

Love, love, love these undies.

Love, love, love these undies. They're so comfortable. Nice and stretchy at the waistband. The longer length on my legs prevents my thighs from touching. The material is slickity so your clothing doesn't stick to them or ride up. Kinda expensive but I guess you pick what works for you and these work for me.

Diane E.

They are very comfortable and

They are very comfortable and I look forward to wearing them for leisure and sleeping.

We recommend ordering based on your measurements
 Size (USA) Waist (in) Hip (in)
Small 30-31 37-38
Medium 32-33 39-41
Large 34-36 42-45
X-Large (1X) 37-38 46-49
2X 39-42 50-53
3X 44-48 54-57
4X 49-53 58-61
5X 54-58 62-66
 Size (USA) Waist (cm) Hip (cm)
Small 76-79 93-97
Medium 81-84 99-104
Large 86-91 106-114
X-Large (1X) 93-96 116-124
2X 99-107 127-134
3X 112-122 137-144
4X 124-134 147-154
5X* Fusion only 137-147 157-163


Shortlettes are generously sized  to hug but not squeeze your curves.  They are not compression and do not feel like nylons/hosiery, shapewear, bike shorts, or compression pants.  Shortlettes are simply comfortable.  They are not made to be tight, feel constricting, shape, pinch, or bind.  The longer lengths allows for maximum chafe protection and comfort.

Correct Fit Guidelines:
✔️ Waist should not roll
✔️ Body should glide comfortably against the skin
✔️ Legs should not ride up while walking

Signs of Incorrect Fit:
✖️ Baggy crotch (too big)
✖️ Running at the seams/Wears to fast (too small)
✖️ Slides Down (too small)
✖️ Legs ride up (too small)

Which is the best fit?

CarrieRae's Recommendations:

Under 5'4" - High Thigh, Athletic, or Classic Styles

Plus Size - Fusion, Classic, or Original Lace

Apple Shaped - Fusion, Classic, or Original Lace

* Order the size in-between your waist and hip measurement.  I.e.  Waist 3X + Hip XL = Order 2X

Pear Shaped - Try them all!

Hourglass - Lace or High Thigh

Slender - High Thigh or Athletic

My Shortlettes fall down, why? Are Shortlettes shape wear? Are they compression shorts?
How are Shortlettes different than other slip shorts or bike shorts? How long do Undersummers products last? Can you let your Shortlettes Show?

Contact Us:  Do you have a question that is not answered here?  Email us at and we will respond within 1 business day. 

updated 6/22/20