Depending on the original length of the skirt, 1cm could mean the difference of "just right" where the skirt hem comes down to the knees and "too much skin" around that section where her thigh can barely be seen.
You have no idea how much of a tease that missing 1cm can be for such a proper girl like Houshou.
Ah! A-Admiral!Good morning!
You're looking fine as usual, aren't you! Ehehe...Ah, yeah. Good morning...?I wonder what's wrong? ...the toilet?No, it looks like her skirt is 1cm shorter.That's not even really that different, is it?Admiral.For real?For real...If you were to say it to me, I'd give you a real beatdown.Huh? But 1cm... I didn't even realise.Those words of yours. Depending on the listener, it might get you smashed.
Be careful.It does seem that it was actually the 2ndCarDiv that did the shortening to her, though.