Hi Shin Kai Kan. What you experienced is fairly typical. As the gi sizes increase the length and width increase simultaneously, which means individuals with a little bit of a belly do tend to experience long gi situations in order to accommodate that weight. Size 7 will be shorter but also less accommodating via width. If you decide to try it, I would recommend not washing the 7. Your other primary option is to go with an 8 and have all that length hemmed.

Thre length is not the problem since you pointed out it can be hemmed, the issue is the width in that its disproportionate. The top is exidingly Lang as would be expected for a size 8 but the width is far too narrow, the jacked barely closes around him. I'm not sure this is the original design of the uniform.

I see. This gi is a pretty typical cut and not designed to be particularly slender. As such it might be prudent to bump up to the size 9 found here: un-ju-863.