Here’s a clear breakdown of the product you’re describing — a seamless open-bodysuit shapewear for women, combining multiple features.

Key Features (as listed):
- Type: Bodysuit / Full body shaper
- Tummy control – targets midsection compression
- Seamless – no visible lines under tight clothing
- Open crotch – convenience for bathroom without removing the suit
- Shorts style – extends to upper thighs, preventing thigh chafing
- Waist trainer – often with reinforced abdominal layer
- Butt lifter – designed with shaping seams or contours to lift glutes
- Slimming underwear – all-in-one firm control garment

Who it’s for:
- Worn under dresses, bodysuits, high-waisted pants, or tight skirts
- Smooths lower belly, love handles, back fat, and thighs
- Suitable for daily wear, weddings, parties, or postpartum shaping (not medical grade)

Pros & Cons:
| Pros | Cons |
|---|---|
| One-piece convenience | Can feel restrictive for long hours |
| Open crotch avoids total undressing | May roll down if too short or low-quality |
| Seamless fabric hides under clothes | Open crotch design not preferred by all |
| Lifts & rounds buttocks | Sizing must be precise (too tight = uncomfortable) |
| Breathable if nylon/spandex blend | Some styles have limited bust support |

Common materials:
- Nylon + Spandex/Elastane (most common) – stretchy, moisture-wicking
- Cotton gusset (even with open crotch, some have partial lining)
- Latex or power mesh for waist area (firmer compression)

Sizing tips:
- Check waist, hip, and torso length – most important for bodysuits
- If between sizes, size up for all-day comfort
- Look for adjustable hook closures (some bodysuits) or stretch-fit seamless
Where to find this product:
Search these exact terms on Amazon, eBay, Shein, or shapewear brands like Shaperx, FeelinGirl, Yummie, Maidenform, or Hanes.
Suggested search string on Amazon:“seamless open crotch bodysuit shapewear tummy control butt lifter shorts”
Would you like a sizing chart guide or brand recommendations for this specific type of shapewear?