Which gi?
I have a gold weave A3/Sirius (750 gsm)
ultra-lite gold weave A2/plain (550 gsm)
single-weave weave A2/samurai (450 gsm)
Both A2 dry overnight (well, by the next day if I wash that night), the A3 *might* be a little sketchy though.
However, I shrunk my A3 over 3 washes. IIRC, hot water is what causes most of the shrinking, the dryer if anything just reduces garment life, not a significant amount of shrinking.
Anyway, my A3 is *almost* A2 size after 3 hot washes + ~hour in the dryer on high heat.
If you just needed to jump start it, my advice is...right after class:
- cold wash
- switch to dryer on cool air (no heat) for an hour.
Either stay up and hang it, or hang it up in the morning. See what sort of results you get from that.
Next step is to repeat but use low heat, etc.
Alternatively (so many options!), hang it up right out of the washer and an hour before class, throw it in the dryer on low heat and keep an eye on it etc.
As much cool water and cool air as you can get though, for both garment life and non-shrinkage.
BTW did not know they were pre-shrunk - I've WANTED to shrink all 3 of mine and been able to (as I said, the A3 has lost enough mass to be an A2.5 or so)
The A3 I've had for over a year, has held up remarkably well considering until last month I was drying it on high-heat after every cold wash (mind you, already shrunken over 3 washes - it will never get smaller)
There's one minor scuff/tear on the bottom of the left lapel from banging up against the dryer however, and that's when I decided to air dry.
However I live around Toronto, ON and I ordered the A2's from serius last week. Got them in 5 days. I say order a second one
edit: all my gi's (3 sirius as described, medium thickness judo gi(guessing ~500gsm), razor thin karate-ish gi) are in my somewhat damp basement, however I have a portable dehumidifier sitting near the $20 rack I bought from walmart to hang them on.
Karate gi was my emergency gi - dries in no time, handles the dryer and for $40, I don't give a shit if it rips etc. Now that I have 4 'solid' gi's, I never use it except when it's like 40 celsius w/humidity etc etc. (yes, that happens in Canada...rarely, but it does ;p )