From: Damian K
Some non-modification improvements I can suggest are:

1) Do something about your hair, the back of the neck is really vulnerable to heat so the less covered it is the better, braid it or buy a skull cap or doo-rag.

2) Make sure your icepacks aren't too heavy. Use just enough of them ohterwise the extra weight you're tugging around wears you out more than the heat they relieve.

3) Take a few minutes to settle into the suit. I find that the worst 10 minutes of fursuiting are the first 10 minutes (and sometimes the last ten). Put your suit on slowly and don't struggle with it. Spend 2-3 minutes with most of the suit on but just stand around or sit down, then put the entire thing on and just sit around with that on for a little while. Get aquanted with your suit, control your breathing, let any initial excitement subside. In a little while your body will realize what's going on and won't spend as much energy producing heat (I still don't know how to teach it to sweat less). From what I've experienced starting slow is much better than jumping into the suit and just going off. Starting too abruptly is like a thermal punch in the face.

Others have offered other suggestions;
- hair in a ponytail
- minimum of clothing, like shorts and tshirt, or leotard
- bandannas
- head elastic rings
- mesh caps for hair
- hair scrunchies for long hair
- as always, ventilate places around the head