What about a cheap temporary kilt? If you were here in the US, I'd reccomend a Stillwater economy, as a "transitional" kilt. For the price, they're outstanding (about $50US delivered, I think). I'm sure that people on the Continent can scare up a decent off the peg acrylic kilt. It might not suit you like a handmade wool kilt, but it could get you through the weight losing time, and then give you time to make sure your weight has stabilized before you invest in a custom kilt again.

Best!