The thing they don't show in movies is the aftermath. After the heroes thwart the villain and stop the end of the world, or in this case stop humans from wiping themselves out, things are...chaotic. Half the leaders from around the world have had their heads blown off and people don't know what to do. It takes a few months of assignments and clean up and missions before things are back to some semblance of order for the Kingsman.

Thats around the time they realize that Roxy still doesn't have a proper suit.