Would I be right in thinking that if you have an intra-Europe, connecting flight (e.g., LHR-MUC-HEL) and one of your legs is in C, that the baggage allowance will be dictated by that leg?

so, LHR (in Y) - MUC - (in C) HEL would grant increased baggage allowance in LHR, even though you’re Y out of there?

or does it have the be that the first leg is in C for you to get an increased bag allowance at origin airport?