dude... you make everything sound so logical with the clues given, i'm starting to think i need to reread the entire manga again
I support! Plus, the floral pattern on her dress matches part of his outfit. He has the same pattern for a part of his shirt.
raw:
https://rawdevart.com/comic/capable-maid/chapter-30/
and becoz y'know she is a maid with slave status she cant afford those dresses....
omg see, nc detail...
wtf is King Johanness thinking -minus points for you... He sent an invitation to Marie but didn't bother to send her a dress.. In this situation there are 2 dress that was shown Blue (from Kiel -he is wearing dark blue) and Yellow (from Rael)... Why did I say that? becoz when you want to escort a person to a noble ball you usually go there with matching colors... In this situation since Marie want to meet the anonymous sender she chose the Yellow dress (since this will match with the sender as well - Cp is wearing matching colors of his invitation)... So the obvious person that Marie wants to meet and escort her is the anonymous sender... Damn CP why too shy.... Never mind you will have more chances soon...