Summarize the following:
Try tucking your external genitals, then put on underwear that’s 1 to 2 sizes too small. For best results, choose garments made of elastic material instead of cotton. You could also try wearing 2 pairs of underwear, wear tight pantyhose over underwear,  or hold everything in place with a compression undergarment.  Play around with combinations of underwear and shapewear until you’ve achieved your desired results. Keep in mind your undergarments shouldn’t cause pain or cut off your circulation. It's possible to position and tape your body parts in a way that allows you to use the restroom. However, when it comes to going to the bathroom, wearing undergarments is more convenient than taping. You can purchase gaffs, or panties made especially for tucking, online and specialty stores. Gaffs are worn just like underwear, but they’re made of an elastic material that’s strong enough to hold the tuck in place. While gaffs are an effective option, many people find them too uncomfortable to wear every day. Additionally, they tend to be a lot more expensive than regular underwear. Specialty products are available online that hold the tuck more comfortably than gaffs. Additionally, some garments are designed to mimic the appearance of biologically female genitalia. On the downside, these products can be hard to find, and they can cost anywhere from $100 to $500 (U.S.).

Summary:
Experiment with tight-fitting underwear or shapewear. Try wearing a gaff. Invest in a garment specially designed for gender-diverse individuals.