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I second Suz's comments, and I have the opposite fit problem. I really like a wider neckline, although I don't like them to be low and revealing. You might consider a bralette --- or something essentially like a bra encased in a half cami. You would be covered if the neckline slipped, and have the added effect of giving you more coverage in lightweight knits
I'm short with a long waist, but I've found that I generally cannot wear regular size Ts with U or V necks because they will hit me too low. Petite Ts in the same brand and style will work. I often need to size down in V necks as well. My girls aren't high or big, but they are full (largish cup size). I also prefer necklines that don't show cleavage, and I don't like to see my navel when I bend over.
This is a problem I have too. When you feel the need to keep checking and adjusting a clothing item it is distracting and certainly doesn't feel comfortable. I recently spent a lot of time sewing up the sides of a boat neck T so the bra straps wouldn't show and I will be extra careful with future purchases. When I find a V or U shape that is good I'm going to buy several.
I use fashion tape and tape it to my shirt ( I volunteer with special need kids and tend to get involved in rambunctious play and j noticed they done time pop out of shirt and create a very naughty view - lol )
I totally agree with everything Suz said. You do look lovely in these necklines but the most important thing is that you feel good in them. I second the suggestion of demi/cup/balconette bras, I find them extremely useful with more open summer necklines.
