Bigger frame in 20s?

[appealisLAW]

So i have been around the same bf % for a few years now, lately i have noticed that a lot of my clothes that were the regular size i wore for years (M) are now getting small and tight without me gaining any fat. Keep in mind i regularly go to the gym but i kept down the intensity and food intake on the lower side for atleast year and a half, so the progress isn't that huge. My dad also told me he started getting bigger (in terms of frame, not bf) when he was about my age since he was scrawny as a teen and early 20s. I also gained couple of kg without gaining any fat in the past year or so (still the same abs visibility).

P.s i didn't mention i was a late bloomer when it came to height. I was around 5'9/10 at 17 and now in my 20s i am around 6'1 barefoot (184)