Does it really matter…? Wear what you like and feel comfortable in. I used to wear Lycra all the time back in the day but moved to baggy shorts as I find them more comfortable and understated. However, I still sometimes wear full thermal roubaix bibtights in the winter if that is what comes to hand or water-resistant 3/4 bibs under waterproof 3/4 baggies – shock horror!
If you have a 6″ full suspension bike and wear Lycra or prefer baggies and a xc orientated hardtail – who really cares. Just get out and ride your bike! All this Lycra is for the serious rider or only fit for roadies or baggy clothing is only for middle aged fat people is rubbish and really lazy – as are all the repeated derogatory comment about people who ride fully rigid or hardtails not being “hardcore” or people riding 6″ trailbikes needing “skill compensators”…
The only people who we should be feeling negative towards are the overly judgemental, rude, inconsiderate and outright aggressive.