It’s inevitable that, if you use pens, ink is going to end up on your clothing somewhere. If you get ink stains on your clothes, it’s not the end of the world. That favourite shirt or top probably can still be salvaged.
The key is to treat the stain immediately before you wash it. Do not throw a stained item of any sort straight into the laundry. Once it’s been through the wash and the dryer, the stain is set into the fabric and is much more difficult to remove.