Tucking, made easy. Tuck it. Slip it. You're done.

Size Chart Thong, medium rise, stretch waistband Transgender underwear MTF THONG ACTIVE FIT - The support you deserve with high-grade, second-skin-feeling compression. Extended and intensive compression, second skin feeling, flat seams located on the outside of the underwear for a comfortable, unmarked fit.  Tuck safel

Tucking, made easy. Tuck it. Slip it. You're done.

FIT4U Solutions

2pcs Crop Tuck Band, Adjustable Elastic crop tuck Band

How to Keep Blouses and Shirts Neatly Tucked

How to Keep Blouses and Shirts Neatly Tucked

FIT4U Solutions

DressTech Tucking Tape (10 Pack) for Transgender and Crossdressers

Tucking — TransHub

3 Pack Crop Tuck Adjustable Band, ANTAND Shirt Tuck Band, Crop Band for Tucking Shirts Lightweight, Comfortable Adjustable Elastic Band Tool That Will Transform The Way You Style Your Tops Multicolor

Tucking, made easy. Tuck it. Slip it. You're done.

Best option I've found for keeping shirts tucked: non-slip rubber grips on the inside of pants : r/malefashionadvice

TomboyX First Line Leakproof Hipster Briefs, Nordstrom