You will find that Hanes tees have a length that works well for tucking in.
Men’s Summer Retro Letter Portrait Printed T-shirt Boxy Fit Y2k Urban Streetwear
A nice touch is how the short sleeve length stays put without rolling up.
Vintage 1990 Only God Can Make A Tree Genealogists Family Tree T Shirt USA Large
The graphic print here is a photo-realistic image that looks almost like a sticker.
Shaka Wear 6.0 oz Active Short Sleeve T-Shirt (More Colors)
You will like Shaka Wear for the way it hangs without clinging.
6 PACK Shaka Wear 7.5 oz Max Heavyweight Short Sleeve T-Shirt
What I like is the solid pattern, which keeps your look cohesive and tidy.