The Mr. Porter summer sale just dropped as everyone is still stuck in the refractory period following Memorial Day purchases. If you didn't know, Mr. Porter sales are generally unrivaled in regard to value for the level of inventory available. It's not really a time to be buying J. Crew chinos. It's a time to be buying things you absolutely love for years.
In terms of strategy, the first tier of the step-wise discounts - up to 50% off - is best for buying things that don't normally go on sale. Think classic staple items or big purchases (like my Hand Oiled Schott Perfecto from a few years ago). Something like this Private White VC Twin Track Jacket that Ian Anderson/From Squalor To Baller did a review on a few months ago - a really nice price for what's essentially a next-level Barbour, and what I'd be looking at myself to pick up if I was in the market. I doubt all sizes are still going to be available come morning.