Try and look on it as an easy way to convince her you can do that job. After all, if it's only clothes, it's not like you've got a boss who ignores fancy suits and focuses upon actual ability and results.
I found people like that are surprisingly easy to keep happy - you provide them with stuff that looks good - attractive displays, colour graphs, spreadsheets with subtle colours for each section, full colour resources and they tend to go 'oh, lovely!' and not actually get around to dissecting the content.
I had loads of grief about Appropriate Clothing from one head. I was told I must wear 'clothing and footwear commensurate and reflective of the professional position you hold within the school'. Cool. I'm a lighting and sound engineering professional when I'm not providing instrumental tuition. I've worn full blacks and steel toecaps rather than skirts and cardigans ever since.
Oh the first day I did this, I was nearly coralled and bollocked for it, but I cut the Head off at the pass by smiling and saying I'd love to stop, but the foldback chain was picking up a 50Hertz buzz from an inevitable ground loop and, although I'd tried using a couple of TR bundles, it wasn't long enough between numbers 2 and 3 on the chain and I therefore had to run a second TR to XLR from Aux 2 on the main board rather than the sub into the multicore snake to come out of number 37 and then XLR it so that there was a balanced signal going into the back of monitor two and then slave that with another shielded bundle because I couldn't use the passives, as they were needed for the main mix stack coming out of the Yamahas with Speakon and the longer Tip and Ring was going into the Stagepas. All before 10.30.
I also make really good posters.
She left me alone.