If you're making your own suit---
You have your choice - design 100 % movie accurate and cover every little detail with latex, or design for long term wear and do some design changes to make it easier to vent some of that heat out of your suit so you can wear it longer.
Try to 'ventilate' a few places where your blood vessels are close to your skin,
head, wrists, hands, ankles feet, groin, underarms, (sometimes inner elbow & back of the knees if you can conceal its not being latexed ).
I split my Mr Incredible suit into 2 pieces. its easier to wear, transport and store as 2 parts. Top and bottoms combine the waist of old shorts to the bottoms so they wear better. That gap will allow for air to gasp through there occasionally and let you get those legs off easier for bathroom breaks - lol
My Rule of Thumb - if people can't see into a spot easily - I don't cover it with latex.
- I prepare Groin and Underarms of the I suit without full latex. I brush a few rough small spots here and there for texture - but primarily without latex this lets it breath where its badly needed. With all that armor, hanging loincloth fabric you can afford to have a spots that are concealed free of latex so air can push through.
- places where gauntlets and legging armor are going to cover - I leave that with out latex too. - no need to smother yourself further than you are.
- Feet - huge boots smothered in latex are HOT - I actually wear sandals and strap the feet bits and armor on top with lots of concealed cracks and gaps all around the base, so that air gets through with every step.
- Back of the Pred mask/head - Ventilate below dreadlocks covering holes with appropriate colored fabric
- Neck - pred gorget - I'm making my current one out of thin breathable fabric with strips of Foamie for structural shape.
- Since I sculpt my own masks - usually with nearly closed mandibles - I leave off the inside of the pred mouth and inner chin - nobody can see in there so why have it - air moves freely between preds teeth.
- Gloves - cotton gloves with latex on top of the hands - palms airbrushed fabric to let it breathe.
I was able to wear my last costume for a full day no problem - you just have to decide what features are most importat to you and focus on that.