Lifestyle tips

Maybe it's just me, but the gaps between actual sizes shrink as they go up- like a 4X is closer to a 5X than a medium is to a large.
Also, for practically, find a good store or two and keep in mind vaguely how their stuff fits on you. Online is not always your friend- I ordered a too-cheap 6XL bowling shirt once, and their wacked-out standards would have put me in a 9 or 10XL.
P.S. in case you didn't already- avoid polyester in the summer as you get bigger. What becomes slightly warm will instead be very hot.

In popular clothing chains like Sinsay, I could easily fit a M/L, whereas in C&A or New Yorker, an XL wouldn't fit me.

Although it's harder for me with pants, because my butt grows faster.