Hello "Mrs.C"...Thanks for posting!

You know a traditional kilt is a garment for men, Steve most likely told you this several times (just a wild guess). No women's skirt is made like a kilt...the pleats, the aprons, the high rise, the leather straps, the weight of the fabric, the tartan and the craftmanship.
You say: "It does still look "feminine" to me." well...a kilt is a skirt, that's true and without the accessoires it can look like a women's skirt.

The wide belt, the sporran, the kilt hose and sturdy men's shoes...and sometimes a tie and jacket make the outfit complete and it becomes clear someone is wearing a kilt...not just a skirt.
(start to worry when Steve starts to wear high heels j/k )

The kilt is worldwide recognised as a garment for men and...the kilt was...and still is...associated with the military, bravery and even rebellion.
Your husband is very proud of his Scottish heritage and his ancestors fought many battles...probably wearing the kilt on the battlefield.
To him the kilt is not a skirt...it's not a midlife crisis oddity. It represents his pride and respect for something very dear to him.

Nobody can tell you to like it, but maybe you can understand it.

Kind regards,

Robin