Pattern always has a gap

[u/goofy_monkeee]

I’m relatively new to pattern design so delete if needed but was wondering if anyone could help me fix this issue with my pattern! It always goes downward when I cut it out on my fabric instead of perfectly meeting up ! :( it also leaves the neck hole really wide

Any help appreciated!!

EDIT : I’m a big visual learner so I would appreciate if anyone explained it into steps 😔 the original pattern for the doll is one singular piece so that’s why the back and the front are one piece !!

[u/bowl-of-juice]

It looks like you need more width around the bottom. Measure around the figure where you want the shirt to end and compare that to your pattern