It depends in your local market profit margin but it should not harm the needy people who need the cloth but can’t afford the high price. The Hadeeth say: Sell if you get any profit إذا ربحت فَبِع .
It is good to consider the financial abilities of people when you add your percentage to sell.
There is Hadeeth from Imam Jafar Al-Sadiq (AS) when rejected taking high profit from a businessman who took money from the Imam for business and returned the capital with high profit. Imam refused taking the high percentage of profit and took the capital back.
Wassalam.