Is wix a good site to open a clothing store?

It is as good as any.  Basically you just need a site that is easy to load and provides a shopping cart and payment options.

But, if you do not want to fail, take a few weeks and sit down with your accountant 9or any accountant) and make a business plan that predicts profits and losses(if any).

If you taught yourself some html, CSS, and some basic PHP, you could make your own, and easily alter it to be whatever you want it to be.

You need a business plan first.  Call your lawyer or CPA or try Fiverr.