Not an offset issue. Oh well. I'll take a look myself and tighten things up if things start to annoy me too much, although I suck at OS. Then again I won't have to dick around with physics (yet) so maybe it won't be so bad. And thankfully it's just 9 pieces, thank you Bethesda, I guess.
If it is not an offset and is an actual mesh issue.
Do the following in OS.
1. Load the Jane Body as a ref (choose ref and instead of using the drop down click on the browse option and go to the \fallout4\data\tools\bodyslide\sliderset folder and double click on the JaneBod.osp
Jane should load as the reference will all of the sliders.
2. Load the outfit you need to adjust (data\meshes\bla bla bla\ armor folder \ nif).
3. Under Sliders choose "Load Preset" and in the drop down choose the preset you use in game.
It should adjust the Reference into your shape.
4. Now check for any part of the outfit that clips thru the reference body.
If you find that one or more then one of the meshes in the outfit clip you will need to fix them with the brushes (but only fix one at a time). You will need to high light the mesh to make adjustments to it.
Note: you can minimize meshes that are in the way by clicking on the eyeball icon that is next to the name (in the top right panel of OS).
Note 2: you may get a message about saving any adjustments, make sure you have one of the outfit meshes high lighted in the top right panel and not the reference mesh (which should show up in green letters in the top right panel as well).
5. Once all of the clipping has be resolved do an export, export nif (without reference) and overwrite the old version.
Yeah Part 4 is where you do all of the work and I just kinda tossed it in there as a lump sum thing.... if you need a good guide to working in Outfit Studio... the read thru Blabba's Tutorial over in the Skyrim Adult section.
Not much has changed in how to do things in OS since that tutorial was writen.... well option 3 was added so you can actually load a preset (which is kinda nice).
Alternate option to steps 1 (and skipping step 3): load the naked body from the meshes folder as the reference.
Load Reference in the pop up Browse to the location: fallout4\data\meshes\actors\character\characterassets\ and double click on the femalebody.nif.
Note: you will not get sliders just the preset shape you use in game.... but since you are resolving a clipping issue with the shape you use in game it works just fine.
Well I've been up for most of the day so I'm crashing folks