To expand on what Thor said, here's specifically how to convert to a KOTOR II model.
First, you'll need the s_female02 supermodel from K2. The files can be extracted with Kotor Tool, but they're tricky to find so I'll attach them to this comment.
At this point, you can place the model and its texture into the override folder, but they won't work in-game. I assume that by replacing sentinel clothing, you mean replacing what default clothing looks like when equipped. KOTOR II uses commoner models for the PC's default clothing so you'll need to do some manual editing of appearance.2da.
Kind of a lengthy explanation, but let me know if this works out for you.
s_female02.zip