Buy or not to buy?

Guys, I’m torn and I need help! So I just went into a bridal salon to Figure out what style looks good on me and I think I found my dress. I keep wanting to put it back on and keep wearing it. I could picture myself walking down the isle in it. Now here is the kicker. My wedding is October 8th,2023. I have not planned to lose weight anytime soon. The dress I tried on was a 28W and it was way way to big on me and a 24W was skin tight. So I need a 26W which they do have. My problem is should I buy it or not. Should I just forget about this dress and look closer to my date? I’m so torn on what to do? I do know that if I do gain a lot of weight then a 28W will have to be my size. But a 26W can be let out to that size. This dress is all me all over it. I love it that it is plain and that it has pockets. So because this dress is at David’s bridal they won’t have this dress when I get married. This dress will be gone by next year. So this is why I’m very torn. This style of dress is what I like and My taste more than likely won’t change. This dress has everything I wanted in it for an amazing price. Also here is a picture of me in the dress. This dress after tax is under $600. Also sorry about the bad photos.