My dad will be interred at Arlington Cemetery in the next couple of months. My best friend is planning to attend.

In the past she has embarrassed me before on three occasions wearing a black skirt and knee socks combo that in my opinion is too short for how she carries herself; you can see her bum if she bends over the wrong way etc. I hate to feel like a slut shamer or to be policing what women wear but it is personally not something I would ever wear as I feel it is too revealing (ironic as I work a side job that involves nudity/little to no clothing). 

Would I be a dick if I ask her what she's planning on wearing? Obviously it'll likely be black which is why I'm worried this too-short-skirt (again, imo) might make an appearance. It would make me feel anxious because I know for sure my mom and sister would be judging her for it (they are a lot more conservative than I am) and I'm worried I'd be focusing on that and getting anxious about it rather than being present at my dad's ceremony.

tl;dr: WIBTA if I ask my friend what she plans on wearing to my dad's inurnment because I'm afraid she might wear a skirt I consider too short?