Matching clothing dimensions/rig to model without parenting
I'm sure it's probably very simple, but from all the tutorials I've watched online, I've come to realize that at the most basic levels, I don't even have my program set up correctly, because all these peoples' UIs look nothing like mine. Anyhow, I've discovered that for some of my models, especially those with muscular definition, no amount of smoothing on the clothes will fix them shrinkwrapping to every nook and cranny of the body. So what I'd like to basically do is just match the rig of the clothing item to the rig of the body, but not parent them so the clothing keeps its original shape. As always, I export my models over to Blender afterwards, so I can do any fine-tuning there (sculpting, weight paints, etc.). I just need the rigs to be roughly the same dimensions before I start. Why? Because some of the model morphs will be at 100% scale, but there's still an obvious difference in size/height between that and the base shape. In some of the various tutorials I've watched on different things, the creators have done something (if I remember correctly) like right-clicking, going to edit, and doing something with matching rig to shape (?). But I don't know the nuts and bolts of the program, so I'm probably messing/mixing that up.

Comments
The UI is meant to be changeable (as it is in Blender) - you caan try other options via WIndow>Workspace>Select layout or just open panes through Window>Panes(Tabs) or right-click in an empty area of a pane groups tab area and drage them around the screen or into docking areas.
You could simply apply a Rigidity group to the whole garment, to block all morph projection (Geometry Editor tool, switch to Vertex mode, right-click>Geometry Selection>Select All, right-click>Geometry Assignment>Create Rigidity Group from Selected as I recall). You could alternatively block specific morphs by creating a new property with the same name (get the name of the morph by clicking the gear icon on its slider>Parameter Settings; create a blocking morph by right-click in the Parameters pane and enabling Edit Mode, then right-click>Create New Property and give it the name of the morph you want to block).