ISS missions are planned months if not years in advance so a last minute wardrobe change doesn't seem to add up.
In my day job we plan development and infrastructure work and we take some pride in being thorough. I expect ISS mission planning is orders of magnitude more involved.
That said, in a related comment I came across Canadian astronaut Chris Hadfield commenting on this[0]. It seems the suits are available though Chris seems to be of the opinion that those choices would have been made quite some time ago.
It's taken decades for NASA to refine and release their new space suit. This is a flight suit, so it may be a bit different, but it's not as if one walks into any old tailor and asks for a new flight suit. There has to be lead time, approvals, etc. involved
Flightsuits are not complicated and the NASA ones, almost the same as the ones used in orbit, have been sold at the Kennedy Space Center Visitor Center in adult sizes, or at Space Camp. As I recall, the actual astronauts receive standard sized flightsuits which are adjusted by a tailor. Astronauts are almost required to look sharp in public.
US military pilots sometimes order squadron flightsuits, with minimal approvals and lead time. If the pilots really wanted to, they are actually measured and tailor made for the pilots, instead of custom ordered from standard sizes.
More notably,the US Navy Blue Angles actually walk into a tailor in Pensacola, Florida and get measured for a flightsuit. A few days later they walk out in the first blue and yellow flightsuits we all at airshows, they test fit that suit, fly with it, make any adjustments, before several additional flightsuits are made.
For the 75th Anneversary of the Blue Angels[1], they had yellow suits made, presumably with command approval, and it couldn't have been difficult or expensive to have them tailor made for limited use.
The Russian cosmonauts and their tailors would have a pretty good idea of what material is approved for space use, and what they have in stock, so tailor made flightsuits would not be a huge undertaking. I'd assume they actually do have a tailor make or adjust the flight suits for the cosmonauts, to minimize the chance of snagging something in space.
In my day job we plan development and infrastructure work and we take some pride in being thorough. I expect ISS mission planning is orders of magnitude more involved.
That said, in a related comment I came across Canadian astronaut Chris Hadfield commenting on this[0]. It seems the suits are available though Chris seems to be of the opinion that those choices would have been made quite some time ago.
[0] https://twitter.com/Cmdr_Hadfield/status/1505150427335176195