I needed a very low strapless longline bra to go under a sheer dress. So I bought both bras in 36C the same day and put them on top of each other. It's exactly the same model except for two things: the micro fiber for the 206 invisible effect  and this model 203 the back strap is nearly 3 inches shorter. Apart from the strap you hook up it's exactly the same bra. There's a mistake in the waist size. To make this work buy a strap extention or buy a bigger size. This type of bra is very hard to find. Both are true to size for the bust but the 203 is way undersized in the waist. That's why everyone has been complaining about bulging. I've decided to give this bra to my daughter who's a 34C and has a tiny waist. This bra is much cheaper but less nice and less comfortable. The other advantage with the 206 is that it's more versatile and looks much nicer under something sheer.