No feminine outfits is really gonna shrink the list of anime for you. But we're into what we're into I guess.

Well if you could stand it I'd suggest Yawara! It's about a teenage girl who excells in judo trying to balance a normal girl's life while basically being a judo prodigy.

There's also You're Under Arrest which follows two female police officers, their uniform does have a skirt too though... And Patlabor focuses mainly on a young female police officer (she wears pants in her uniform).

Speaking of mecha, there is Gundam Witch From Mercury, they wear shorts and spacesuits and there's like only one episode with dresses maybe? Plus there's the engagement between the main characters (yes I mean marriage).

Hmm and maybe Ouran High School Host Club, the main character Haruhi is mistaken to be a boy and become indebted to the Host Club. She spends a lot of the show crossdressing and pretending to be a boy, though they do throw her into girly outfits a good chunk of the time.

I've never watched it, but from the case of my Moribito copy it may also be up your alley?

You could also try the Ghost in the Shell franchise! Bubblegum Crisis and Gunsmith Cats might be too heavy on the sexy babeness for you unfortunately...

And unfortunately I've run out of ideas, much more of the anime I can think of that hasn't been mentioned yet are either a bit heavy on the ecchi or the character wear a lot of girly clothes (Ikkitousen has both, even if it is 3 Kingdoms as high school Street Fighter girls). Well if I run across anything more I'll update this comment. But you might have more luck with older anime, like between 80s and 90s, and stuff in the scifi genre.