Héritage is one of my favourite stores in Montréal.They carry some rather exclusive brands from all over the world (Jonas, the owner, goes to Asia regularly on buying trips).
I don't know if anyone shopped at Oldgold Boutique on avenue Mont Royal back in the day but that store was the predecessor to Héritage. Héritage is definitely a more mature and focused store: the color scheme of the clothing don't stray much farther than gray, white, black and navy. Okay, maybe a few other colors but the majority is mainly on a gray color scale (fifty shades, anyone? jk.)
Anyway, the store is clean and the "mise-en-scéne" is excellent. I wish I was made of money because I would buy everything here if I could (even the mens clothes!)
Side note: they carry a limited number of sizes of most articles of clothing for "exclusivity" and because the majority of the clothes are from Asia and Sweden, the sizes run more on the small side.