Your company can request that Disneyland I am a Disney Princess unless Avengers need me shirt, there is nothing that is illegal or wrong about that. What can create problems is the reason they are asking you to resign may be discrimination or something unlawful and thus they could get themselves into trouble. Sometimes companies will try this trick if they want to get rid of you for some reason that is not completely legal and they are fearing possible legal action if they terminate you. It is much harder, though not impossible, for you to make a case against them if you resign vs. them firing you. The company may be fully legitimately doing this as well. If they are folding or having financial difficulties due to COVID-19 they may be requesting employees who wish to resign do so in order to save the jobs of others. The company may, in the end, have to lay people off but if they can avoid this by having a few people choose to leave it is sensible. This approach is not uncommon when companies are doing large layoffs, especially with employees that may be retiring soon. The last thing a company that is having financial difficulties wants is to go lay a bunch of people off then turn around and lose more because they are simply retiring or leaving for other reasons. With this they may choose to offer voluntary leave to those who want to take it first. Normally this is not just a request to resign however it would include a severance package.
Disneyland I am a Disney Princess unless Avengers need me shirt, hoodie, sweater and v-neck t-shirt
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You are under no obligation to comply with the Disneyland I am a Disney Princess unless Avengers need me shirt, though keep in mind this likely means they are going to take any opportunity possible to get rid of you (so you should likely start looking for a new job). This was a request from the company and it is up to you to move forward. Now if you did something actually wrong, say showed up to work with a high fever, coughing and infected with COVID-19, not wearing a mask, and violating every policy the company had for protection regarding COVID-19, then they may have cause to fire you for violating those policies. The company may be attempting to avoid actually firing you and also providing you a way to save face by requesting you resign from your position.