One is a .357 S&W Model 65 3" that shipped in Nov. 1985; I'm not sure if that makes it a 65-1, 65-2, 65-3, etc. or what those designations mean, but I've had this gun for a while. The other is this Charter Arms Classic Undercover .38 Special.

For the .38, I have an OWB holster that I've had for a while but never worn, and just picked up this generic IWB holster that I kind of like and have now worn a few times. However, I'd like one that I can tuck a shirt over since I need to look semi-professional but am not a huge fan of sweaters/jackets in Texas. So if anyone has recommendations on those - or even a good place to look for them - I'd appreciate it. I'm used to just being able to go on Amazon and find what I need easily, but the numbers and types and nuances of all these different types of holsters is a bit overwhelming, and the ones I'm seeing on Amazon that might work are not reviewed so it's hard to know what I'm getting.
For that S&W M65, same deal, wondering if it's practical to conceal IWB since it's a good deal bigger. Any suggestions on that front, especially for something I can wear with a tucked in shirt?
If anyone has general insights about these guns or tips you've found useful from a concealment standpoint, I'd appreciate anything you can share. It seems like a lot of what I read is about non-revolvers, and I've thought a lot about getting something new, but to me it just seems like a revolver is the easiest thing to use if you need it in a pinch and you never have to worry about it jamming or a round getting stuck, etc. But again, I'm pretty new to carrying so would love to hear from others on your preferences and rationale.
Thanks!