Hi
@alostsoul some of my ftm friends (they're like online friends but hey) tend to use what are called as "Binders". It's similar to what transgender women wear, like transwomen tend to tuck their di*ks with tap and some good quality cloth so that when they wear girl's dresses like skirts or long dresses, their dick or the shape of it doesn't get exposed.
Transmen usually use what are called as "Binders" which are basically these very elastic clothing that you slide across your boobs. This cloth will force your boobs against your body (cus the cloth is elastic) and compresses your boobs until it looks flat up there.
Between this is coming from a transgirl, so I don't really have a lot of information about this, you can checkout some subreddits I guess, and you should definitely ask your doctor before you do anything. I see people wearing binders, but I don't know if it has any negative impacts on you or not, so you should definitely think about this and consider the choices.
Even for transgirls, tucking is not always a good idea. Tucking results in germs getting accumulated in that place, or making it impossible to move around (cus you're constantly crushing your balls ugh) etc. Luckily for most transgirls, once they start HRT, their dick doesn't get hard and starts to shrink. which is SO MUCH BETTER than a dick that feels like it has a "life of it's own".
I think as for transmen, they go for a top surgery after some time cus you know the breasts have already developed.. I've seen men posting pics of their topsurgery and I feel like it's absolutely worth it! (oh i follow a ton of trans people in tumblr lol)
http://www.f2mbinders.com/
https://www.amazon.in/s/?ie=UTF8&keywords=ftm+binder&tag=googinhydr1-21&index=aps&hvadid=183157565709&hvpos=1t1&hvnetw=g&hvrand=9822703716325876978&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9062139&hvtargid=kwd-378647955087&ref=pd_sl_ewgevlr45_e