Please, please, please never change your men's shirt sizing! My boyfriend is 5'4", which it's difficult finding him every day clothes but even more difficult to find him athletic wear. Size small fits him perfectly! The shirts are not super long or billowy as many standard US men's smalls are (based on 5'7" btw). Since the first shirt fit so well, he got a second and the long sleeve.
Bonus points, these shirts are super soft and comfortable.
Huge fan of this shirt and own it in two colors. Great for running every day and just hanging around.
M's Runterra SS Tee in Cove
The good: color and design. The quality of the product and craftsmanship is also very good.
The bad: size and fit. It's been a long time since I've struggled with a brand and sizing like I have with Janji. For your reference, I'm 6'2" and 160lbs. Mediums in almost every other brand fit me great. Supposedly this shirt should be 27" long (which, if it stayed true, would be fine), but after a washing - and, yes, according to the label - it shrunk to under 25". Now it sits at that awkward length where it's just short enough to not look very good. It's definitely a bummer since instead of being a first choice out of my drawer, it's now regulated to being the "everything else is dirty" shirt.
Suggestions: They call this shirt athletic fit, but it's still pretty boxy compared to athletic fit clothing from other brands. It can be more trim. Additionally, all of their tops (including outerwear) need an extra inch in length, at the very least. After buying three different tops now, I've come to the conclusion that I just have to wait until they rethink their sizing and fit.