Yes a lot of things change at 9.99 seconds. But not that much for the driver.
slower than 10.0 you are only required to wear a 3.2a/1 jacket. In my opinion I would step up to the next level.
Faster than 10.0 seconds the driver needs a 3.2a/5 jacket and pants, a neck collar, a gloves 3.3/1. A full face helmet is also required.
Here is an example of SFI ratings for fire jackets
SFI Rating Time to 2nd Degree Burn
3.2A/1 3 Seconds (required for 10.0 and slower)
3.2A/5 10 Seconds (required for 9.99 to 7.50)
3.2A/15 30 Seconds (required for 7.50 and quicker)
3.2A/20 40 Seconds (required for Top Fuel)
Yearwood does have a lot of jackets in stock. In fact they are Stroud. I would go try one one to see how it fits before buying a custom suit. I would get a 3.2a/5 jacket and pants if it was me
I wish I would have done that ^^
If you're gonna be drag racing for a while, you should prolly buy the good stuff the first time.
Yearwood has them in stock.