I can understand you wanting to avoid conflict with your parents over this. Is there a reason you feel like you would want to talk to them about it? If it's something you'd rather be private about, there certainly isn't anything wrong with that.
Do you feel like you have enough privacy in your home that you'd be able to acquire and store clothing that you could at least wear privately in your room? I realize that with a lot of social distancing restrictions in place due to covid-19, it's harder to get out and do shopping on your own than it normally would be, so even if you do have reasonable privacy it may not be easy to pursue this right away, if you don't already have clothing on hand.