Welcome. Alot of this is about priorities. Keep in mind we live in a VERY appearance based society. If you don't look good, you won't get the promotions, you most often won't even get the 2nd interview for the job. It can be very very hard to obtain gainful employment if you don't look nice. FFS can alter your chances significantly in the positive direction.
It has nothing to do with work ethics, personal referals, previous experiences.. in the female world a lot of your hiring is based solely on looks alone. To deny it is to deny tons of evidence pointing this simple value out (for better or worse).
It often becomes a catch 22 for many. Can't get the job because you can't pass. Can't get ffs because you can't get a job or hold one). Can't pass because you can't get ffs. Vicious cycle. So get ANY job... and save every penny. Get rid of your cell phone. Go online at the library. Don't buy that new dress you really really would love to have. Thrift stores are your friend! Scrimp, save, and put away. Avoid 'rainy day' problems because eventually the money gets used up quickly as there are many 'rainy day' scenarios.. except the obvious ones like cars and a roof.
I too live with someone that was less than enthusiastic about me getting FFS. They ended up spending 10k on a shop that went bust anyways.. so I said F* it (fudge of course) I'm getting FFS. It was the one demand I put .. the only one.. on our relationship. My partner did not like it at all, and it did cause a strain financially. However once it was done, they readily admitted it helped me look better. I'm now the 'trophy wife'.
If in the end they aren't supportive at all? There are choices to be made, difficult ones. And I'm not sure I'd be right in telling you what to do.. that is only something you can conclude. I hope I have helped a little