Some people just have to have what ever is new or in' at the time, it does not matter if they personally like it or not they just buy what is in style. Well I guess if you are a person who just likes to follow the crowd then by all means go ahead and do that, or if you are a teenager who has to buy what everyone else is buying then it would be an absolute must. Otherwise I guess this would be up to your personal choice.
You don't always have to buy the latest dress styles out there, unless of course you like it, then you should definitely go out and buy it. Sometimes the thing that everyone else is wearing and looks good for them might not work on you and that's why it's very important to be an individual and buy what you like and what would work for you which is not necessarily the latest style out there on the market.
I mean you definitely don't want to be stuck in the past with a wardrobe made up of extremely dated fashion styled dresses, no matter that styles might recycle and come back in fashion eventually, you can't sit around and wait for that eventuality. Recently low rise jeans with a small flair at the bottom of the leg have been the fashion and while a lot of people look good in these jeans, if you have love handles they are very apparent in these jeans and so they're not for everyone despite their popularity so be aware of how the style looks on you before buying. Take a day and try things on in the stores before you buy them because things that look good on everyone else or that look good on the hangers in the stores may not suit you. And no matter how pretty that skirt is or how nice that top is if it doesn't flatter your figure, you shouldn't wear it.
Don't get me wrong, not all old fashion dresses are bad there are still some old dress styles from many years ago that still look great up to this day like simple blue jeans or button down business shirts have been around for decades and are still a perfectly acceptable outfit. But like I said you should buy what looks good on you and not anyone else. So it is good to keep up with up to date dress styles but don't throw out your old clothes.