Fellow Mother's I need advice on 14 year old girl.?

I have a 14 year old step daughter I am only 22 myself so we don't have a big age difference between us. Her Dad tends to be a little strict when it comes to clothing for her. I just recently was able to talk him into letting me take her cute bra and underwear shopping (he allowed no thongs though). I remember being 14 and I wore thongs. So to my question he also didn't allow her to wear mini skirts until just recently when I took her and got some with built in shorts underneath. I was out and about shopping today and found some really cute strapless tops for her. I went ahead and bought them but now I'm thinking he might not approve. Fellow mothers is it ok for a 14 year old girl to wear a strapless top? She would either have a strapless bra underneath or her bathing suit (we leave for a 2 week trip to Florida in a week.)? I am also curious about whether or not I should take her with me to get a spray tan before we go? I get a spray tan every week and she has been getting more and more curious about it. I already take her to get a mani pedi every 2 weeks.