I'm sure the stock price not gonna tank even at the most difficult time unless the whole economic is turning upside down only then these luxurious things lost value.
even like that after economic condition has gotten better these company will more likely to make a comeback, these stuffs are timeless so i don't expect these company to really went bankrupt at the time of economic crisis.
so your strategy is pretty spot on unless you forgot 1 thing that things change, these luxurious companies usually start off from being an underdog then climbs up to become luxuries company.
by the time you found one in the stock market you can almost be sure that its already too late since stock price already increased so high the only way to go is to go down.
Don't forget that russian oil gas money goes into Luxury sector also alot through switzerland brokers and then from there into south france and monaco and to italy you see by owning shares of luxury sector it's like you own shares of russian oil gas companies because a lot russian energy money flows into luxury business.
Luxury company shares are good way to own for example globe wealth the people like putin will always make a lot money and look at the putins brands he like to wear italy luxury brand jacket wich not cheap If Putin would be smart instead of doing the dirty work he would be just investing into Luxury sector but it's all good let people like Him work and bring that money into Luxury sector.
That's just one example but there is many more people who work hard and rob others
( so they do the dirty work and bring money to Luxury field )