Here's How To Grow Out An Undercut The Right Way
If you're struggling to simply let your hair grow out without doing something to it, you have a few options. First, you can go shorter with the rest of your hair by asking for a pixie cut. A pixie cut is tailored to your face shape and looks chic and modern, according to Finder. Plus, it will blend very well into an undercut, and your hair should have an easier time coming together when you finally grow it out.
Another option is to experiment a little with the style that you've got, and try out different parts. If you tend to part your hair on the side and switch to a middle part for a change, you could easily hide an undercut on the sides of your head, per Style Caster. Note that this style might only work with smaller undercuts, and won't hide a particularly large, shaved portion of your head.
Ultimately, the best thing you can do is embrace your hair as it grows out. Explore the world of hair accessories, and see if different clips or headbands can help you create styles you will enjoy while you play the waiting game. You can also experiment with buns or braids, and gel down your undercut if necessary to prevent poufy sides. It will take some time, but your undercut will grow.