There is no need to sew the waist retainer on the pants or belt, just insert the button into the slit of the waist retainer, and then secure the waist retainer button through the pant hole. Number: 5 "Belt Extension Buckles.
eBay
Zipper Latex Waist Trainer Body Shaper Tummy Slimming Shapewear Women Tummy Wrap Waist Trainer Corsets for Women Waist Slimmer
Aliexpress UK
10 Pcs Elastic Waist Extenders, Adjustable Trouser Button Extenders Waistband Expanders for Pants Shorts Jeans. 【No Need to Sew】Just connect the waist extender to your shirt or trousers, and then connect the other end to the button groove, which can add extra space and is very convenient to use.
eBay
Men Waist Support Belt For Back Pain Waist Trainer Trimmer Belt Gym Waist Protector Weight Lifting Sport Body Shaper Corset Faja
Aliexpress UK
eBay
Electric Waist Massager Lumbar Traction Device Heat Spectra Vibration Waist Spine Support Back Massage Machine Waist Relax
Aliexpress UK
The 4/12pcs No-Sew Jean Waist Extenders are adjustable pants button expanders made from plastic. These extenders are designed to fit securely onto the existing jeans button, providing a simple and effective solution for expanding the waist size of jeans without the need for sewing.
eBay
Waist Protector 20pcs Tourmaline Self Heating Magnetic Waist Support Waist Belt Abdomen Belt Lumbar Spine Warm Fever Band
Aliexpress UK
Due to the different monitor and light effect, the actual color maybe a slight different from the picture color.
eBay
3-in-1 Waist Buttoned Bra Shapewear for Women Waist Shaper Women's Shapewears Snatch Bra - 3-in-1 Waist Trainer Bras Daily
Aliexpress UK
6-piece set jeans & trousers button extenders. Suitable for most jeans and trousers, they are easy to remove and reuse whenever needed. Type: Jeans / Pants Button Extender. These jeans and pants button extenders provide a simple and convenient solution for tight waistbands.
eBay
AOLIKES 1PCS Professional Adjustable Waist trimmer Slim fit Abdominal Waist sweat belt Waist back support belt Fitness
Aliexpress UK
Type: Button Extender / Expander. Upgrade your comfort instantly with this 12-piece collar, neck, and waist extender button set, designed to give your shirts and pants extra room without the need for alterations.
eBay
JASONTUTU Neoprene Sport Waist Belt Support Body Shaper Waist Trainer Loss Fitness Sweat Belt Slimming Strap Waist Trimmer
Aliexpress UK
Quickly add extra space to the waistline area of your favorite dress pants. The waistband is changed to a large size, only one step is required, and the nail is detachable and can be used repeatedly.
eBay
Tourmaline Waist Brace Support Belt Band Self Heating Lower Back Supports Magnetic Therapy Lumbar Waist Bandage Back Waist Belt
Aliexpress UK