You can't get the racing suit on a starter save unless you use the oyster glitch (might have a different name... idk), you need to have progress with Michelle (or other girlfriends) below a certain percentage, I think it's 0. Then, if you collect the final oyster, the percentage magically jumps to 45%, which allows you to go on a she drives date with Michelle, something that isn't possible with 15% progress when you meet het, because she only wants to go eat until around 30%.
All other dates fail immediately on a starter save, because of permanent 4 star wanted level in SF, so the only way to get 100% progress early with Michelle is to use this glitch and then only do she drives dates, if she wants to go eat/dance, just reload.
Yeah, as OrionSR said, gimp suit (and she drives) dates don't trigger the jealous girlfriend script and thus can't disable it.
And in short, the easiest way to get FI girlfriend cars while having a successful date is:
- Lure the jealous girlfriend near your date's house
- Enter the marker and wait until the jealous gf is near you (like a few seconds before the 'you have been spotted' cutscene)
- You can accept hot coffee now for extra percentage if you want, but this isn't necessary, you can just wait until she catches you
- The date's over, counts as successful, and you can grab jealous gf car now, or tow it