Two immediate thoughts come to mind.
First, shredding/cutting someone's clothes is done out of pure rage. A cheater, or another similar offense seems to elicit this type of rage.
The small-ish pants (size 6) and the contrasting 36D bra suggest someone with a "memorable" figure. I think this is a jealousy and rage response.
And yes, I consider the find a very ominous sign. Looking for missing women who have 36D busts should certainly narrow the possibilities.
Amateur opinion and speculation
36D breasts and size 6 waist isn’t as uncommon as you think. I’d actually say it’s pretty common in younger women (late teens to early 30s).