I bought several dresses for summer that are sleeveless but cut deeper into the shoulder area. The dresses are  not T-back but definitely would show the straps of a regular bra. If your bras currently fit tightly with straps let out, this will not work. Your bra needs to fit with tightened straps because you will need to loosen them to allow the clip to pull the straps together. Mine worked perfectly and stayed flat to my back. I was not aware of feeling the clip, but bra definitely had a little more lift! LOL  The pack I bought was a 6-pack, 2 each of clear, black and nude.

The reason I gave it a 4.5 was because it is not something I can imagine anyone putting on without assistance. My husband had to put it on for me or otherwise I probably would have dislocated my shoulder trying to attach the clip.