Sounds like the old Qantas uniform we had from 94 to 03! Gold buttons always falling off
Id say you will change over the same way we did. I did a 3 day trip and changeover day was the last day of my trip so I had to drag the new one around for 3 days. The airline issued a cutover day with "1 months grace period" for those who didnt have it, or who had fitting problems etc, so it was no suprise to have half a crew wearing Navy with white shirt and red scarf /tie(old) and the othe rhalf wearing Black with white shirt and Brown Scarf/tie or dress.... It looked really odd I must say, and felt really sorry once on the airbus where 1 crew member out of 10 was the only one wearing the old uniform....
Im sure you will love your new uniform, its great getting a new one..something new and fresh!!!
Later