fat ass and officewear

File: normal outfit kleiner.png (1MB, 1300x824px) Image search: [Google]

1MB, 1300x824px

Hello,
i work as a software engineer in an office and i just cant wear shirts(with buttons, in germany they are called hemd). they are always way to flabby at my belly, but too tight at my chest(you can see them spread at the buttons)

i also have way to short legs and a too big ass. most trousers just highlight my ass, so i just stick with black/darkblue chinos from h&m

first picture is my normal and casual outfit, which i also wear to work(+ sizes/girth). second my better stuff, which i dont wear because things never fit and it just feels wrong

any tipps and tricks for my situation? maybe someone can recommend a brand? or am i to harsh?

please officewearthread!