My two cent: I guess at least
Now: For at lvl 60 everyone pretty much will have either vendor gear or farm the HELL out of Tundro for gear Take my sister for example farmed so much Tundro gear for her hunter. At 70 again Vendor gear, only people probably have it mixed but honestly it's all BASICLY the same stuff (Basicly doesn't mean it fully is.) 75: CQ gear and if lucky maybe some BF acc for defense. But that's not what was mentioned. What was mentioned was 85 sooooo let's focus on 85.
I don't see hiding gears as "Needed" the reasons are as follows:
For the following let's completely exclude Wings and Moolah costumes FOR THE MOMENT.
What is the options for 85 BF? BF acc is likekly, As is a cape (by the way capes have all the same stats from BF just saying, at least to my knowledge) Next we have Armor: There is only four options and you can EASILY tell which option by the simple LOOK of the armor those are as followed.
Imbued gear from Enraged Tundro/Sakun (Does anyone even HUNT these anymore?)
Imbued gear from Circus insane (GG prepare to die)
Battlefield gear: (....)
Or Chain quest armor (More than likekly)
mostly LIKELY the last option, unless people are just battlefield fiends wanting to proove a point and beat the CQ gear with normal stuff. POWER TO YOU HARD WORKERS
Now Weapons: Okay weapons i give you are different and SO SO many
Golden Temple weapons (Rusty/Brilliant Sun/Moon)
Imbued: Nereus, Ulric, Livid
Enhanced Lisk
Or Chain Quest.
Now unlike armor, THAT is up to your own preference
Relic and wearing cards? Yes yes there is that, but honestly either they have a relic from tears, the gold one, or they were just lazy guys and got the Sublime seal just to have relic. You just have to assume. But study them and you'll EASILY know what class would grab which relic.
Costumes though? Yes that's tricky but most (remember we aren't counting moolah YET) were around for the OLD tear costumes and thus would have one with set effects. Or just spend points to get military one from BF.
Cards? Well use common sense here.What would your class need the most? what would THEIR class need the most. Excludeing moolah which gives all stat 30, There is very few options
All stat 18 farmer.
Lisk All stat 24 farmers (BRAVO)
Or VI cards to fit class
Or a mixture of the above
By VI cards i mean, a templar would go Power Stam mix cards of course stami for HP and Defense, Power for the attack boost to be able to hold aggro.
Now moolah is different, All that wings, all the costumes, all the cards, Yeah it's insane difference. but it's common knowledge that if you are the same class as them, have same gear, same title yet they are kicking your tail HORRIBLY you can assume either 1 of two things.
A: You don't know how to play your class well and they do,
or
B: They are rocking all stat 30 and have a bit of a higher edge than you do.
Now TL;DR if you know the game, you know what to look for and you know the items well enough you can make a guess on gear without even having to look at them. so why hide them if you can easily guess?
Finally Armor, gears, etc etc is fine and all but Selka said it best up above: You can rock the same gear as them and same cards, same everything, but if they grabbed skills you didn't, that can make a huge difference. Also remember there is things to take into consideration such as buffs, Food, potions, transformations. Gears are only roughly a 1/3rd of the game, knowing the extra tricks are what makes the difference.