Garter ties

[piperdbh]

Any decent fabric shop will have woven ribbon/tape for sale by the yard. I'd suggest buying 2 1/2 yards, cut it in half, tie knots in each end, fringe a couple of inches past the knots, and have yourself some perfectly acceptable garter ties.

[TheOfficialBren]

Agreed. Garter ties are my personal preference. I use Matt Newsome's easy - tie method. It never fails and leaves no bulge. They are very traditional, too. When I first started kilting up I went straight for ties rather than flashes specifically because they are an older but timeless traditional article. Just my two pence. Your mileage may vary.

[tulloch]

To hold up your hose you can use elastic bands or anything that will tie and not be uncomfortable. They do not have to show. I got a pair of the fabric tabs that hang from an elastic band and have used them a few times. Then I found the ones I tie myself as in the above Matt Newsome posting. I have been using them for over five years during which time I have had to darn some holes in several pair of hose. I found some selling cheap at a highland games for spares. They remain spares. They don't wear out fast and are worth the price.
I also made a pair for fun that I have used a few times - knitted in the garter stitch.