I dont know how exactly to answer your question... Gaining always ends up showing up on your body eventually, loose clothes/shape wear can only hide so much...
If you're asking about not making it obvious you're purposely gaining, dont pig out with your friends, dont wear form fitting clothes, use shapewear... if you want to covertly drink gainer shakes or other fattening things, hide them in opaque water bottles.
If you want to soft launch gaining, talk about being stressed, not being able to work out (if you previously were/are), complain about temptations...
Then stuff yourself in secret 🐷
1 week