I like what this website says in it's FAQ section.

Here is a sample of what I mean:

If I’m buying a kilt do I have to buy all the other clothes to go with it?
No . . . if you live near a kilt hire specialist then you can hire the bits and pieces that you need for a special occasion. If you’re wearing the kilt as a casual item of clothing then look upon it as you would a pair of trousers. Those can be worn with Doc Martin boots and a T-shirt so why not wear the kilt in the same way.
If you’re going to semi formal events then you probably do need a few additions to your wardrobe. A conventional suit jacket would look silly with a kilt as would a pair of ankle socks so save up for a kilt jacket and some kilt hose.