I wanted to share a great little item I recently found that may be of interest to you if you like wearing your shirts tucked but have trouble with them staying tucked. It is a shirt/bodysuit combo from Express that is of fairly nice quality.  I have very long torso and shirts usually don't stay tucked, but bodysuit versions are usually too short in the body.  This particular version is long enough in the body (in the reviews even women as tall as 5'11" said it works for them), and the bottom part is bikini cut and soft.  I did have to size up from my usual XS to S to avoid button gaping at the chest, but since the fit is pretty tailored the S works. I liked it enough that I bought all the three colors: white, black and striped and I hope they come up with light blue, too.

ETA: Added a photo me trying on the striped version. Excuse the folds and wrinkles, it needs a good steaming due to the strange packaging.

(FYI, especially for Greg:  for some reasons the Finds from Express won't lead directly to Express items. If interested I would go  directly to the website and search for "shirt bodysuit")