Buy Bikini How Do I Get Mum To Buy Me A New Bikini?

How do I get mum to buy me a new bikini? - buy bikini

Ok, so I am in a bikini at the time, but I hate it. The top has a foam, which I like and the ground is not very flattering. I asked him to buy a new one and told me he had bought one for me. I really want for a party this weekend, but she said nothing. I was aware a lot of bikini, not to lose. All ideas on how to persuade her to buy a bikini before this weekend?