As has already been mentioned there are plenty of 'universal' and fashion tartans and you are free to get a kilt made in non-tartan material. There are many styles of kilts as well; traditional, contemporary, with pockets and such. There are different styles of pleating to consider.

As for vendors, some have been mentioned already, but I'll highlight a few that I am most familiar with. Rocky of USA Kilts in PA has a great range of products to accommodate your budget. Josh and Gabe of Sky Highland Outfitters in CA are a bit smaller company that offers similar products at a slightly lower price. Both of those vendors offer worsted wool and P/V kilts from the top mills in the UK. Their selection of 'casual' P/V kilts make a great first kilt for a low price. All of these kilts are made to your measurements and will take at the very least 3-4 weeks to make. Steve of Freedom Kilts in Canada provides a wide range of great quality products with a focus on more contemporary kilts with options for pockets and non-tartan fabrics. Matt Newsome also offers an exceptional range of custom kilts. I also own a 'heavyweight' from Stillwater Kilts which is a decent, inexpensive wool kilt machine made in Afghanistan. I advise against Sport Kilt.

I urge you to read through the articles available on Matt's personal site as well as the many great posts in the Member Written Articles section of this forum.