A Lab subject would have probably taken a shot or two of serum, so if you wanted to go by category, 2-5 mutations. Random ones, could get to 12 (two shots of mutagenic serum) but I’d imagine they’d stop/purify earlier than that.
Or if you want to have the scientists be really Out There, four or five shots of related serums with a Purifier as well. You’d have 6-10 mutations from a few trees, and likely a level or two of mutagen addiction.
In any event, these would be fixed sets. We got rid of the random-augs “Cyborg” starting trait to eliminate startup re-rolling, as that’s no fun.
Clothing would be the subject suit, a mutation-compatible jumpsuit with minimal storage. You might have scrounged a fork or maybe a lighter on your way out but that’s about it; the suits deliberately don’t have much pocket-space so the subjects can’t equip themselves.
Since we don’t yet have variable starting locations, “Someone’s Pet Project” wouldn’t work. The Lab culture wouldn’t let stuff out of the Labs anyway, and I suspect there are games that address that sort of thing already.