hello i was told to come here to ask my question but i'm

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hello i was told to come here to ask my question but i'm still not sure if this is the correct board since i'm not looking for fashion advice

i need to get coveralls for trade school but i've no idea how they're supposed to fit.
i've tried on a size that fits just about right with my normal clothing underneath, but there is resistance in the shoulders when i lift my arms. a size larger gets rid of that problem but is baggy and i end up looking like pic related. i'm worried the bagginess will interfere with whatever i'm working on

is it normal for coveralls to be baggy like this? also do tailors even tailor coveralls?
thanks