Honestly that will be plenty fine for you. No need to overthink it. Tighter is better, speed suit is better, but it's honestly not going to be a deal breaker for you at this point.
I wear my Descente WC and Ski Cross jackets when I race as well, sometimes opting for a tighter soft shell when it's warmer. Might get a bit of gate burn (shoulders/arms from GS); if you are really fussy don't wear your "best" jacket! There are guys I know who's training pants that look like they have a greater %age of duct tape than pant material. I have a great pair of pants that are now relegated to "master's pants" given the amount of gate burn around the lower legs from SL.
Focus on line and other areas that have been identified for you to work on.
Very cool you are clearly excited about bashing gates, and I'm sure you'll have a blast getting back into it. No need to spend on things you don't need. Have fun and you'll quickly discover when you need additional gear or such as you go.
After I learned about "gate burn" no way am I going to wear that jacket racing!